Facebook is the world’s largest social network, with over 1 billion monthly active users.

Facebook was founded by Mark Zuckerberg in February 2004, initially as an exclusive network for Harvard students. It was a huge hit: in 2 weeks, half of the schools in the Boston area began demanding a Facebook network. Zuckerberg immediately recruited his friends Dustin Moskovitz,Chris Hughes, and Eduardo Saverin to help build Facebook, and within four months, Facebook added 30 more college networks.