Social networking sites definition

Social Network Sites: Definition, History,
and Scholarship
By : Danah M. Boyd/Nicole B. Ellison

Michigan State University, 2007

Introduction
Since their introduction, social network sites (SNSs) such as MySpace, Facebook, Cyworld, and Bebo
have attracted millions of users, many of whom have integrated these sites into their daily
practices. As of this writing, there are hundreds of SNSs, with various technological affordances,
supporting a wide range of interests and practices. While their key technological features are fairly
consistent, the cultures that emerge around SNSs are varied. Most sites support the maintenance
of pre‐existing social networks, but others help strangers connect based on shared interests,
political views, or activities. Some sites cater to diverse audiences, while others attract people
based on common language or shared racial, sexual, religious, or nationality‐based identities. Sites
also vary in the extent to which they incorporate new information and communication tools, such
as mobile connectivity, blogging, and photo/video‐sharing.

Social Network Sites: A Definition
We define social network sites as web‐based services that allow individuals to (1) construct a public
or semi‐public profile within a bounded system, (2) articulate a list of other users with whom they
share a connection, and (3) view and traverse their list of connections and those made by others
within the system. The nature and nomenclature of these connections may vary from site to site.

While we use the term "social network site" to describe this phenomenon, the term "social
networking sites" also appears in public discourse, and the two terms are often used
interchangeably. We chose not to employ the term "networking" for two reasons: emphasis and
scope. "Networking" emphasizes relationship initiation, often between strangers. While networking
is possible on these sites, it is not the primary practice on many of them, nor is it what
differentiates them from other forms of computer‐mediated communication (CMC).

What makes social network sites unique is not that they allow individuals to meet strangers, but
rather that they enable users to articulate and make visible their social networks. This can result in
connections between individuals that would not otherwise be made, but that is often not the goal,
and these meetings are frequently between "latent ties" (Haythornthwaite, 2005) who share some
offline connection. On many of the large SNSs, participants are not necessarily "networking" or
looking to meet new people; instead, they are primarily communicating with people who are

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already a part of their extended social network. To emphasize this articulated social network as a
critical organizing feature of these sites, we label them "social network sites."

While SNSs have implemented a wide variety of technical features, their backbone consists of
visible profiles that display an articulated list of Friends1 who are also users of the system. Profiles
are unique pages where one can "type oneself into being" (Sundén, 2003, p. 3). After joining an
SNS, an individual is asked to fill out forms containing a series of questions. The profile is generated
using the answers to these questions, which typically include descriptors such as age, location,
interests, and an "about me" section. Most sites also encourage users to upload a profile photo.
Some sites allow users to enhance their profiles by adding multimedia content or modifying their
profile's look and feel. Others, such as Facebook, allow users to add modules ("Applications") that
enhance their profile.

The visibility of a profile varies by site and according to user discretion. By default, profiles on
Friendster and Tribe.net are crawled by search engines, making them visible to anyone, regardless
of whether or not the viewer has an account. Alternatively, LinkedIn controls what a viewer may
see based on whether she or he has a paid account. Sites like MySpace allow users to choose
whether they want their profile to be public or "Friends only." Facebook takes a different
approach—by default, users who are part of the same "network" can view each other's profiles,
unless a profile owner has decided to deny permission to those in their network. Structural
variations around visibility and access are one of the primary ways that SNSs differentiate
themselves from each other.

After joining a social network site, users are prompted to identify others in the system with whom
they have a relationship. The label for these relationships differs depending on the site—popular
terms include "Friends," "Contacts," and "Fans." Most SNSs require bi‐directional confirmation for
Friendship, but some do not. These one‐directional ties are sometimes labeled as "Fans" or
"Followers," but many sites call these Friends as well. The term "Friends" can be misleading,
because the connection does not necessarily mean friendship in the everyday vernacular sense, and
the reasons people connect are varied (boyd, 2006a).

The public display of connections is a crucial component of SNSs. The Friends list contains links to
each Friend's profile, enabling viewers to traverse the network graph by clicking through the
Friends lists. On most sites, the list of Friends is visible to anyone who is permitted to view the
profile, although there are exceptions. For instance, some MySpace users have hacked their profiles
to hide the Friends display, and LinkedIn allows users to opt out of displaying their network.

Most SNSs also provide a mechanism for users to leave messages on their Friends' profiles. This
feature typically involves leaving "comments," although sites employ various labels for this feature.
In addition, SNSs often have a private messaging feature similar to webmail. While both private
messages and comments are popular on most of the major SNSs, they are not universally available.

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Not all social network sites began as such. QQ started as a Chinese instant messaging service,
LunarStorm as a community site, Cyworld as a Korean discussion forum tool, and Skyrock (formerly
Skyblog) was a French blogging service before adding SNS features. Classmates.com, a directory of
school affiliates launched in 1995, began supporting articulated lists of Friends after SNSs became
popular. AsianAvenue, MiGente, and BlackPlanet were early popular ethnic community sites with
limited Friends functionality before re‐launching in 2005‐2006 with SNS features and structure.

Beyond profiles, Friends, comments, and private messaging, SNSs vary greatly in their features and
user base. Some have photo‐sharing or video‐sharing capabilities; others have built‐in blogging and
instant messaging technology. There are mobile‐specific SNSs (e.g., Dodgeball), but some web‐
based SNSs also support limited mobile interactions (e.g., Facebook, MySpace, and Cyworld). Many
SNSs target people from specific geographical regions or linguistic groups, although this does not
always determine the site's constituency. Orkut, for example, was launched in the United States
with an English‐only interface, but Portuguese‐speaking Brazilians quickly became the dominant
user group (Kopytoff, 2004). Some sites are designed with specific ethnic, religious, sexual
orientation, political, or other identity‐driven categories in mind. There are even SNSs for dogs
(Dogster) and cats (Catster), although their owners must manage their profiles.

While SNSs are often designed to be widely accessible, many attract homogeneous populations
initially, so it is not uncommon to find groups using sites to segregate themselves by nationality,
age, educational level, or other factors that typically segment society (Hargittai, this issue), even if
that was not the intention of the designers.

A History of Social Network Sites

The Early Years
According to the definition above, the first recognizable social network site launched in 1997.
SixDegrees.com allowed users to create profiles, list their Friends and, beginning in 1998, surf the
Friends lists. Each of these features existed in some form before SixDegrees, of course. Profiles
existed on most major dating sites and many community sites. AIM and ICQ buddy lists supported
lists of Friends, although those Friends were not visible to others. Classmates.com allowed people
to affiliate with their high school or college and surf the network for others who were also
affiliated, but users could not create profiles or list Friends until years later. SixDegrees was the first
to combine these features.

SixDegrees promoted itself as a tool to help people connect with and send messages to others.
While SixDegrees attracted millions of users, it failed to become a sustainable business and, in
2000, the service closed. Looking back, its founder believes that SixDegrees was simply ahead of its
time (A. Weinreich, personal communication, July 11, 2007). While people were already flocking to
the Internet, most did not have extended networks of friends who were online. Early adopters
complained that there was little to do after accepting Friend requests, and most users were not
interested in meeting strangers.

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From 1997 to 2001, a number of community tools began supporting various combinations of
profiles and publicly articulated Friends. AsianAvenue, BlackPlanet, and MiGente allowed users to
create personal, professional, and dating profiles—users could identify Friends on their personal
profiles without seeking approval for those connections (O. Wasow, personal communication,
August 16, 2007). Likewise, shortly after its launch in 1999, LiveJournal listed one‐directional
connections on user pages. LiveJournal's creator suspects that he fashioned these Friends after
instant messaging buddy lists (B. Fitzpatrick, personal communication, June 15, 2007)—on
LiveJournal, people mark others as Friends to follow their journals and manage privacy settings. The
Korean virtual worlds site Cyworld was started in 1999 and added SNS features in 2001,
independent of these other sites (see Kim & Yun, this issue). Likewise, when the Swedish web
community LunarStorm refashioned itself as an SNS in 2000, it contained Friends lists, guestbooks,
and diary pages (D. Skog, personal communication, September 24, 2007).

The next wave of SNSs began when Ryze.com was launched in 2001 to help people leverage their
business networks. Ryze's founder reports that he first introduced the site to his friends—primarily
members of the San Francisco business and technology community, including the entrepreneurs
and investors behind many future SNSs (A. Scott, personal communication, June 14, 2007). In
particular, the people behind Ryze, Tribe.net, LinkedIn, and Friendster were tightly entwined
personally and professionally. They believed that they could support each other without competing
(Festa, 2003). In the end, Ryze never acquired mass popularity, Tribe.net grew to attract a
passionate niche user base, LinkedIn became a powerful business service, and Friendster became
the most significant, if only as "one of the biggest disappointments in Internet history" (Chafkin,
2007, p. 1).

Like any brief history of a major phenomenon, ours is necessarily incomplete. In the following
section we discuss Friendster, MySpace, and Facebook, three key SNSs that shaped the business,
cultural, and research landscape.

The Rise (and Fall) of Friendster
Friendster launched in 2002 as a social complement to Ryze. It was designed to compete with
Match.com, a profitable online dating site (Cohen, 2003). While most dating sites focused on
introducing people to strangers with similar interests, Friendster was designed to help friends‐of‐
friends meet, based on the assumption that friends‐of‐friends would make better romantic
partners than would strangers (J. Abrams, personal communication, March 27, 2003). Friendster
gained traction among three groups of early adopters who shaped the site—bloggers, attendees of
the Burning Man arts festival, and gay men (boyd, 2004)—and grew to 300,000 users through word
of mouth before traditional press coverage began in May 2003 (O'Shea, 2003).

As Friendster's popularity surged, the site encountered technical and social difficulties (boyd,
2006b). Friendster's servers and databases were ill‐equipped to handle its rapid growth, and the
site faltered regularly, frustrating users who replaced email with Friendster. Because organic
growth had been critical to creating a coherent community, the onslaught of new users who
learned about the site from media coverage upset the cultural balance. Furthermore, exponential

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growth meant a collapse in social contexts: Users had to face their bosses and former classmates
alongside their close friends. To complicate matters, Friendster began restricting the activities of its
most passionate users.

The initial design of Friendster restricted users from viewing profiles of people who were more than
four degrees away (friends‐of‐friends‐of‐friends‐of‐friends). In order to view additional profiles,
users began adding acquaintances and interesting‐looking strangers to expand their reach. Some
began massively collecting Friends, an activity that was implicitly encouraged through a "most
popular" feature. The ultimate collectors were fake profiles representing iconic fictional characters:
celebrities, concepts, and other such entities. These "Fakesters" outraged the company, who
banished fake profiles and eliminated the "most popular" feature (boyd, in press‐b). While few
people actually created Fakesters, many more enjoyed surfing Fakesters for entertainment or using
functional Fakesters (e.g., "Brown University") to find people they knew.

The active deletion of Fakesters (and genuine users who chose non‐realistic photos) signaled to
some that the company did not share users' interests. Many early adopters left because of the
combination of technical difficulties, social collisions, and a rupture of trust between users and the
site (boyd, 2006b). However, at the same time that it was fading in the U.S., its popularity
skyrocketed in the Philippines, Singapore, Malaysia, and Indonesia (Goldberg, 2007).

SNSs Hit the Mainstream
From 2003 onward, many new SNSs were launched, prompting social software analyst Clay Shirky
(2003) to coin the term YASNS: "Yet Another Social Networking Service." Most took the form of
profile‐centric sites, trying to replicate the early success of Friendster or target specific
demographics. While socially‐organized SNSs solicit broad audiences, professional sites such as
LinkedIn, Visible Path, and Xing (formerly openBC) focus on business people. "Passion‐centric" SNSs
like Dogster (T. Rheingold, personal communication, August 2, 2007) help strangers connect based
on shared interests. Care2 helps activists meet, Couchsurfing connects travelers to people with
couches, and MyChurch joins Christian churches and their members. Furthermore, as the social
media and user‐generated content phenomena grew, websites focused on media sharing began
implementing SNS features and becoming SNSs themselves. Examples include Flickr (photo
sharing), Last.FM (music listening habits), and YouTube (video sharing).

With the plethora of venture‐backed startups launching in Silicon Valley, few people paid attention
to SNSs that gained popularity elsewhere, even those built by major corporations. For example,
Google's Orkut failed to build a sustainable U.S. user base, but a "Brazilian invasion" (Fragoso, 2006)
made Orkut the national SNS of Brazil. Microsoft's Windows Live Spaces (a.k.a. MSN Spaces) also
launched to lukewarm U.S. reception but became extremely popular elsewhere.

Few analysts or journalists noticed when MySpace launched in Santa Monica, California, hundreds
of miles from Silicon Valley. MySpace was begun in 2003 to compete with sites like Friendster,
Xanga, and AsianAvenue, according to co‐founder Tom Anderson (personal communication, August
2, 2007); the founders wanted to attract estranged Friendster users (T. Anderson, personal

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communication, February 2, 2006). After rumors emerged that Friendster would adopt a fee‐based
system, users posted Friendster messages encouraging people to join alternate SNSs, including
Tribe.net and MySpace (T. Anderson, personal communication, August 2, 2007). Because of this,
MySpace was able to grow rapidly by capitalizing on Friendster's alienation of its early adopters.
One particularly notable group that encouraged others to switch were indie‐rock bands who were
expelled from Friendster for failing to comply with profile regulations.

While MySpace was not launched with bands in mind, they were welcomed. Indie‐rock bands from
the Los Angeles region began creating profiles, and local promoters used MySpace to advertise VIP
passes for popular clubs. Intrigued, MySpace contacted local musicians to see how they could
support them (T. Anderson, personal communication, September 28, 2006). Bands were not the
sole source of MySpace growth, but the symbiotic relationship between bands and fans helped
MySpace expand beyond former Friendster users. The bands‐and‐fans dynamic was mutually
beneficial: Bands wanted to be able to contact fans, while fans desired attention from their favorite
bands and used Friend connections to signal identity and affiliation.

Futhermore, MySpace differentiated itself by regularly adding features based on user demand
(boyd, 2006b) and by allowing users to personalize their pages. This "feature" emerged because
MySpace did not restrict users from adding HTML into the forms that framed their profiles; a
copy/paste code culture emerged on the web to support users in generating unique MySpace
backgrounds and layouts (Perkel, in press).

Teenagers began joining MySpace en masse in 2004. Unlike older users, most teens were never on
Friendster—some joined because they wanted to connect with their favorite bands; others were
introduced to the site through older family members. As teens began signing up, they encouraged
their friends to join. Rather than rejecting underage users, MySpace changed its user policy to allow
minors. As the site grew, three distinct populations began to form: musicians/artists, teenagers,
and the post‐college urban social crowd. By and large, the latter two groups did not interact with
one another except through bands. Because of the lack of mainstream press coverage during 2004,
few others noticed the site's growing popularity.

Then, in July 2005, News Corporation purchased MySpace for $580 million (BBC, 2005), attracting
massive media attention. Afterwards, safety issues plagued MySpace. The site was implicated in a
series of sexual interactions between adults and minors, prompting legal action (Consumer Affairs,
2006). A moral panic concerning sexual predators quickly spread (Bahney, 2006), although research
suggests that the concerns were exaggerated.2

A Global Phenomenon
While MySpace attracted the majority of media attention in the U.S. and abroad, SNSs were
proliferating and growing in popularity worldwide. Friendster gained traction in the Pacific Islands,
Orkut became the premier SNS in Brazil before growing rapidly in India (Madhavan, 2007), Mixi
attained widespread adoption in Japan, LunarStorm took off in Sweden, Dutch users embraced

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Hyves, Grono captured Poland, Hi5 was adopted in smaller countries in Latin America, South
America, and Europe, and Bebo became very popular in the United Kingdom, New Zealand, and
Australia. Additionally, previously popular communication and community services began
implementing SNS features. The Chinese QQ instant messaging service instantly became the largest
SNS worldwide when it added profiles and made friends visible (McLeod, 2006), while the forum
tool Cyworld cornered the Korean market by introducing homepages and buddies (Ewers, 2006).

Blogging services with complete SNS features also became popular. In the U.S., blogging tools with
SNS features, such as Xanga, LiveJournal, and Vox, attracted broad audiences. Skyrock reigns in
France, and Windows Live Spaces dominates numerous markets worldwide, including in Mexico,
Italy, and Spain. Although SNSs like QQ, Orkut, and Live Spaces are just as large as, if not larger
than, MySpace, they receive little coverage in U.S. and English‐speaking media, making it difficult to
track their trajectories.

Expanding Niche Communities
Alongside these open services, other SNSs launched to support niche demographics before
expanding to a broader audience. Unlike previous SNSs, Facebook was designed to support distinct
college networks only. Facebook began in early 2004 as a Harvard‐only SNS (Cassidy, 2006). To join,
a user had to have a harvard.edu email address. As Facebook began supporting other schools, those
users were also required to have university email addresses associated with those institutions, a
requirement that kept the site relatively closed and contributed to users' perceptions of the site as
an intimate, private community.

Beginning in September 2005, Facebook expanded to include high school students, professionals
inside corporate networks, and, eventually, everyone. The change to open signup did not mean that
new users could easily access users in closed networks—gaining access to corporate networks still
required the appropriate .com address, while gaining access to high school networks required
administrator approval. (As of this writing, only membership in regional networks requires no
permission.) Unlike other SNSs, Facebook users are unable to make their full profiles public to all
users. Another feature that differentiates Facebook is the ability for outside developers to build
"Applications" which allow users to personalize their profiles and perform other tasks, such as
compare movie preferences and chart travel histories.

While most SNSs focus on growing broadly and exponentially, others explicitly seek narrower
audiences. Some, like aSmallWorld and BeautifulPeople, intentionally restrict access to appear
selective and elite. Others—activity‐centered sites like Couchsurfing, identity‐driven sites like
BlackPlanet, and affiliation‐focused sites like MyChurch—are limited by their target demographic
and thus tend to be smaller. Finally, anyone who wishes to create a niche social network site can do
so on Ning, a platform and hosting service that encourages users to create their own SNSs.

Currently, there are no reliable data regarding how many people use SNSs, although marketing
research indicates that SNSs are growing in popularity worldwide (comScore, 2007). This growth

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has prompted many corporations to invest time and money in creating, purchasing, promoting, and
advertising SNSs. At the same time, other companies are blocking their employees from accessing
the sites. Additionally, the U.S. military banned soldiers from accessing MySpace (Frosch, 2007) and
the Canadian government prohibited employees from Facebook (Benzie, 2007), while the U.S.
Congress has proposed legislation to ban youth from accessing SNSs in schools and libraries (H.R.
5319, 2006; S. 49, 2007).

The rise of SNSs indicates a shift in the organization of online communities. While websites
dedicated to communities of interest still exist and prosper, SNSs are primarily organized around
people, not interests. Early public online communities such as Usenet and public discussion forums
were structured by topics or according to topical hierarchies, but social network sites are structured
as personal (or "egocentric") networks, with the individual at the center of their own community.
This more accurately mirrors unmediated social structures, where "the world is composed of
networks, not groups" (Wellman, 1988, p. 37). The introduction of SNS features has introduced a
new organizational framework for online communities, and with it, a vibrant new research context.

Previous Scholarship
Scholarship concerning SNSs is emerging from diverse disciplinary and methodological traditions,
addresses a range of topics, and builds on a large body of CMC research. The goal of this section is
to survey research that is directly concerned with social network sites, and in so doing, to set the
stage for the articles in this special issue. To date, the bulk of SNS research has focused on
impression management and friendship performance, networks and network structure,
online/offline connections, and privacy issues.

Impression Management and Friendship Performance
Like other online contexts in which individuals are consciously able to construct an online
representation of self—such as online dating profiles and MUDS—SNSs constitute an important
research context for scholars investigating processes of impression management, self‐presentation,
and friendship performance. In one of the earliest academic articles on SNSs, boyd (2004) examined
Friendster as a locus of publicly articulated social networks that allowed users to negotiate
presentations of self and connect with others. Donath and boyd (2004) extended this to suggest
that "public displays of connection" serve as important identity signals that help people navigate
the networked social world, in that an extended network may serve to validate identity information
presented in profiles.

While most sites encourage users to construct accurate representations of themselves, participants
do this to varying degrees. Marwick (2005) found that users on three different SNSs had complex
strategies for negotiating the rigidity of a prescribed "authentic" profile, while boyd (in press‐b)
examined the phenomenon of "Fakesters" and argued that profiles could never be "real." The
extent to which portraits are authentic or playful varies across sites; both social and technological
forces shape user practices. Skog (2005) found that the status feature on LunarStorm strongly

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influenced how people behaved and what they choose to reveal—profiles there indicate one's
status as measured by activity (e.g., sending messages) and indicators of authenticity (e.g., using a
"real" photo instead of a drawing).

Another aspect of self‐presentation is the articulation of friendship links, which serve as identity
markers for the profile owner. Impression management is one of the reasons given by Friendster
users for choosing particular friends (Donath & boyd, 2004). Recognizing this, Zinman and Donath
(2007) noted that MySpace spammers leverage people's willingness to connect to interesting
people to find targets for their spam.

In their examination of LiveJournal "friendship," Fono and Raynes‐Goldie (2006) described users'
understandings regarding public displays of connections and how the Friending function can
operate as a catalyst for social drama. In listing user motivations for Friending, boyd (2006a) points
out that "Friends" on SNSs are not the same as "friends" in the everyday sense; instead, Friends
provide context by offering users an imagined audience to guide behavioral norms. Other work in
this area has examined the use of Friendster Testimonials as self‐presentational devices (boyd &
Heer, 2006) and the extent to which the attractiveness of one's Friends (as indicated by Facebook's
"Wall" feature) impacts impression formation (Walther, Van Der Heide, Kim, & Westerman, in
press).

Networks and Network Structure
Social network sites also provide rich sources of naturalistic behavioral data. Profile and linkage
data from SNSs can be gathered either through the use of automated collection techniques or
through datasets provided directly from the company, enabling network analysis researchers to
explore large‐scale patterns of friending, usage, and other visible indicators (Hogan, in press), and
continuing an analysis trend that started with examinations of blogs and other websites. For
instance, Golder, Wilkinson, and Huberman (2007) examined an anonymized dataset consisting of
362 million messages exchanged by over four million Facebook users for insight into Friending and
messaging activities. Lampe, Ellison, and Steinfield (2007) explored the relationship between profile
elements and number of Facebook friends, finding that profile fields that reduce transaction costs
and are harder to falsify are most likely to be associated with larger number of friendship links.
These kinds of data also lend themselves well to analysis through network visualization (Adamic,
Büyükkökten, & Adar, 2003; Heer & boyd, 2005; Paolillo & Wright, 2005).

SNS researchers have also studied the network structure of Friendship. Analyzing the roles people
played in the growth of Flickr and Yahoo! 360's networks, Kumar, Novak, and Tomkins (2006)
argued that there are passive members, inviters, and linkers "who fully participate in the social
evolution of the network" (p. 1). Scholarship concerning LiveJournal's network has included a
Friendship classification scheme (Hsu, Lancaster, Paradesi, & Weniger, 2007), an analysis of the role
of language in the topology of Friendship (Herring et al., 2007), research into the importance of
geography in Friending (Liben‐Nowell, Novak, Kumar, Raghavan, & Tomkins, 2005), and studies on
what motivates people to join particular communities (Backstrom, Huttenlocher, Kleinberg, & Lan,

9

2006). Based on Orkut data, Spertus, Sahami, and Büyükkökten (2005) identified a topology of users
through their membership in certain communities; they suggest that sites can use this to
recommend additional communities of interest to users. Finally, Liu, Maes, and Davenport (2006)
argued that Friend connections are not the only network structure worth investigating. They
examined the ways in which the performance of tastes (favorite music, books, film, etc.) constitutes
an alternate network structure, which they call a "taste fabric."

Bridging Online and Offline Social Networks
Although exceptions exist, the available research suggests that most SNSs primarily support pre‐
existing social relations. Ellison, Steinfield, and Lampe (2007) suggest that Facebook is used to
maintain existing offline relationships or solidify offline connections, as opposed to meeting new
people. These relationships may be weak ties, but typically there is some common offline element
among individuals who friend one another, such as a shared class at school. This is one of the chief
dimensions that differentiate SNSs from earlier forms of public CMC such as newsgroups (Ellison et
al., 2007). Research in this vein has investigated how online interactions interface with offline ones.
For instance, Lampe, Ellison, and Steinfield (2006) found that Facebook users engage in "searching"
for people with whom they have an offline connection more than they "browse" for complete
strangers to meet. Likewise, Pew research found that 91% of U.S. teens who use SNSs do so to
connect with friends (Lenhart & Madden, 2007).

Given that SNSs enable individuals to connect with one another, it is not surprising that they have
become deeply embedded in user's lives. In Korea, Cyworld has become an integral part of
everyday life—Choi (2006) found that 85% of that study's respondents "listed the maintenance and
reinforcement of pre‐existing social networks as their main motive for Cyworld use" (p. 181).
Likewise, boyd (2008) argues that MySpace and Facebook enable U.S. youth to socialize with their
friends even when they are unable to gather in unmediated situations; she argues that SNSs are
"networked publics" that support sociability, just as unmediated public spaces do.

Privacy
Popular press coverage of SNSs has emphasized potential privacy concerns, primarily concerning
the safety of younger users (George, 2006; Kornblum & Marklein, 2006). Researchers have
investigated the potential threats to privacy associated with SNSs. In one of the first academic
studies of privacy and SNSs, Gross and Acquisti (2005) analyzed 4,000 Carnegie Mellon University
Facebook profiles and outlined the potential threats to privacy contained in the personal
information included on the site by students, such as the potential ability to reconstruct users'
social security numbers using information often found in profiles, such as hometown and date of
birth.

Acquisti and Gross (2006) argue that there is often a disconnect between students' desire to
protect privacy and their behaviors, a theme that is also explored in Stutzman's (2006) survey of
Facebook users and Barnes's (2006) description of the "privacy paradox" that occurs when teens

10

are not aware of the public nature of the Internet. In analyzing trust on social network sites, Dwyer,
Hiltz, and Passerini (2007) argued that trust and usage goals may affect what people are willing to
share—Facebook users expressed greater trust in Facebook than MySpace users did in MySpace
and thus were more willing to share information on the site.

In another study examining security issues and SNSs, Jagatic, Johnson, Jakobsson, and Menczer
(2007) used freely accessible profile data from SNSs to craft a "phishing" scheme that appeared to
originate from a friend on the network; their targets were much more likely to give away
information to this "friend" than to a perceived stranger. Survey data offer a more optimistic
perspective on the issue, suggesting that teens are aware of potential privacy threats online and
that many are proactive about taking steps to minimize certain potential risks. Pew found that 55%
of online teens have profiles, 66% of whom report that their profile is not visible to all Internet
users (Lenhart & Madden, 2007). Of the teens with completely open profiles, 46% reported
including at least some false information.

Privacy is also implicated in users' ability to control impressions and manage social contexts. Boyd
(in press‐a) asserted that Facebook's introduction of the "News Feed" feature disrupted students'
sense of control, even though data exposed through the feed were previously accessible. Preibusch,
Hoser, Gürses, and Berendt (2007) argued that the privacy options offered by SNSs do not provide
users with the flexibility they need to handle conflicts with Friends who have different conceptions
of privacy; they suggest a framework for privacy in SNSs that they believe would help resolve these
conflicts.

SNSs are also challenging legal conceptions of privacy. Hodge (2006) argued that the fourth
amendment to the U.S. Constitution and legal decisions concerning privacy are not equipped to
address social network sites. For example, do police officers have the right to access content posted
to Facebook without a warrant? The legality of this hinges on users' expectation of privacy and
whether or not Facebook profiles are considered public or private.

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Social networking sites definition

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