1. Facebook began as a college directory but grew rapidly to become one of the largest social networks globally due to its ease of use. It allows users to create profiles, connect with friends, and share updates and photos.
2. Some concerns about Facebook include user privacy and "stalking" given the visibility of profile walls and news feeds to friends and advertisers. However, additional privacy settings have been added to address these issues.
3. Studies show that Facebook has minimal impact on reducing real-world social interaction for college students, who spend only about 30 minutes on the site daily. However, it remains a significant part of social and communication norms.