Facebook is also beginning to play a larger role in our professional relationships. How many of us "friend" co-workers or use the service to network professionally? Facebook, with 900 million users, could give LinkedIn () a run for its money when it comes to  professional networking and as a career building tool.    

Before there was Facebook, there was MySpace (and Friendster, and High5, and some other networks, but let's focus on MySpace). On MySpace, people didn't have to write down their full names -- they didn't have to be "Sarah Jacobsson Purewal," they could be "Sarah," or "Bob," or even "~++pRiNcEsS++~." But then Facebook came along and demanded that people use their real names and dates of birth, and people, well...did.  

In other words, Facebook has managed to destroy the trend of people hiding behind goofy usernames on the Internet. The social network has over 900 million monthly active users, the majority of whom are using their real names.