<P> Facebook is a social networking service launched on February 4, 2004 . It was founded by Mark Zuckerberg with his college roommate and fellow Harvard University student Eduardo Saverin . The website's membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area, the Ivy League, and gradually most universities in the United States and Canada, corporations, and by September 2006, to everyone with a valid email address along with an age requirement of being 13 and older . </P> <P> FaceMash, Facebook's predecessor, opened in 2003 . Developed by Mark Zuckerberg, he wrote the software for the Facemash website when he was in his second year of college . The website was set up as a type of "hot or not" game for Harvard students . The website allowed visitors to compare two female student pictures side - by - side and let them decide who was hot or not . </P>

Who is the founder of facebook social network