People say that Facebook is for connecting with the people you went to school with and Twitter is for people you wished you had gone to school with. While Facebook is a multi-purpose social networking platform, allowing users to chat, post photos and notes, and play games, unlimited post length. Twitter is built around the posting of short 140 character messages, or “tweets.” They are the two most popular social networks in the world. This comparison looks at their history, growth in user base, strengths and weaknesses.