Exploratory facebook social network analysis with gephi

Exploratory Facebook Social
Network Analysis
with Gephi

Thomas Plotkowiak
twitterresearcher.wordpress.com

Process

1. Import Data with Netviz
2. Gephi

1. Open 7. Labels
2. Layout 8. Community detection
3. Ranking (Degree) 9. Filter
4. Statistics 10. Label Adjust
5. Ranking (Betweenness) 11. Preview
6. Layout (Size Adjust) 12. Export

Netvizz

1. Sign in to your Facebook account
2. Search for netvizz application
3. Choose parameters you would like to include in the data (e.g.
gender, wall posts count, interface language)
4. Analyze either
– Your personal friend network  today
– [OR] one of your groups listed at the bottom
5. Wait for the application to create the .gdf file and download it
(right click, save as)

Gephi

• Gephi is an open-source network analysis and visualization
software package.
• Envisioned as providing "easy and broad access to network
data", it's advertised as being "Like Photoshop for graphs."
• Gephi has been used in a number of research projects in the
university, journalism and elsewhere.
• The Gephi Team: Mathieu Bastian, Sebastien Heymann, Julian
Bilcke, Mathieu Jacomy, Franck Ghitalla

Gephi: 1. Open

• From File menu select
Open and then select
the .gdf file you saved
from Netvizz
• At first it looks like a big
hairball, so we'll change
the layout to make some
sense of the connections

Gephi: 2. Layout

• From the Layout module on
the left side chose Force
Atlas* from the Dropdown
Menu, then click run
– Force atlas makes connected
nodes attract each other, while
unconnected nodes are
pushed towards the periphery
• Click stop when it seems
that the layout has
converged towards a stable
state

*For graphs with a large number of nodes or edges rather chose Yifan Hu Layout

Gephi: 3. Ranking (Degree)

1. Chose the Ranking-Nodes
Tab in the top left module
and chose Degree from the
dropdown menu
– Degree = number of
connections
2. Hover your mouse over the
gradient bar, then double click
on each triangle to choose a
color for each side of the
range
– Try to use bright colors for the
highest degree and dark for
lowest
3. Click apply

Gephi: 4. Statistics

• Click the Statistics tab in the
top right module
• Click Run next to Average
path length
– Chose directed from Popup
Menu
• Click close when the graph
reports shows up

Gephi: 5. Rank (Betweeness)

• Return to Ranking in the
top left module and click
Chose a rank parameter
from the dropdown
– Chose Betweeness Centrality
from the dropdown menu
• Click on the icon for size,
instead of color
– Set min size to 10 and max
size to 50 (experiment a little)
• Click Apply

Gephi: 6. Layout

• To keep the larger nodes
from overlapping smaller
ones, go to the Layout
tab and check the Adjust
by sizes box
• Click Run and then Stop

Gephi: 7. Labels

• Click the bold black T in
the toolabar at the bottom
of the window to turn
labels on
• Click the black letter A in
the same toolbar to select
the Size Mode for the
labels, and choose the node
size option
• Use the slider on the right
to adjust the size
• You can also change the
font style by clicking next
to the slider

Gephi: 8. Community Detection

• Go back to the statistics tab
on the right and click Run
next to Modularity
– Check randomize and click OK
• Go to the partition tab in the
top left module and click the
refresh arrow
• Choose modularity class
from the dropdown menu
– Right click to randomize colors
• Click Apply

Gephi: 9. Filter

• Go to Filters in the top right
module and open the
Topology Folder
– Drag the degree range to the
box below ("Drag filter here")
• Click on Degree Range to
open the Parameters
– Click on the "0" and change it to
a slightly higher value
– This removes the nodes that are
not connected to many other
nodes
• Click Filter

Gephi: 10. Label Adjust

1. Go to the Layout module
on the left
2. Chose label Adjust layout
to make the labels not
overlapping
3. Click Run and then Stop

Gephi: 11. Preview

1. At the very top click on the
Preview tab
2. Under Node, check the box
"Show Labels"
3. Click Refresh at the bottom,
and choose your label font
4. Play around with the
options until you like your
graph (Don't forget to click
refresh every time)

Gephi: 12. Export

• To Export your graph for publication in SVG or PDF
click the Export button
• Save

Gephi: 13. Make sense out of it
Friends from swimming club

Roommate & swimming club
Friends from
staying in Japan
Friends from studies at the
University of Mannheim

Friends from studies at the
University of Waterloo

Joined me on
Friends from school the exchange to
Canada

Hungry? Need More Data?

• Use NodeXL
• Write own crawlers
(ask me)
• Use existing archives
– http://snap.stanford.edu/
– http://vlado.fmf.uni-
lj.si/pub/networks/pajek
– http://vlado.fmf.uni-
lj.si/pub/networks/data/
ucinet/ucidata.htm
• Collect by Surveys

Exploratory facebook social network analysis with gephi

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