Facebook has seen significant user growth since its founding in 2004. A year after its founding, Facebook saw its user base increase from an estimated 1 million to over 5 million users. By the end of 2007, Facebook’s user base had swelled to 58 million active users; by 2009, that number had increased to over 360 million active users. According to its S-1 filing, Facebook currently has over 900 million active users.1
Also in its S-1 filing, Facebook provides two metrics for measuring its user base: monthly active users and daily active users. (Facebook defines a monthly active user as one that has interacted with the platform in the past thirty days.) In March 2009, Facebook had 197 million monthly active users and 92 million daily active users; by March 2011 it had 680 million monthly active users and 372 million daily active users, increases of 245% and 304%, respectively.