Facebook began as a social networking site created by Mark Zuckerberg and classmates at Harvard in 2004 to connect college students. It has since grown to over 8 million US users and allows anyone over 13 to create a profile, add friends, send messages, and update their status. Mark Zuckerberg was born in 1984 and, as the creator of Facebook, is now one of the youngest billionaires with a personal wealth of $4 billion from founding the second largest social network after Myspace.