This document summarizes and compares three major social networking sites: Facebook, Twitter, and MySpace. Facebook allows status updates, sharing of information, notes, pictures, videos and messaging. Users can tag and comment on pictures. It includes games that can be played individually or with other users. Privacy and security settings allow users control over what is shared. Twitter focuses only on status updates and comments, though users can link to TwitPic to share pictures. MySpace allows status updates, personal blurbs, blogs, and full customization of user pages including video, backgrounds, and music.