Facebook is one of the largest and most popular social networking platforms in the world. It was founded in 2004 by Mark Zuckerberg, Dustin Moskovitz and Eduardo Saverin while they were students at Harvard University. Initially, Facebook was only available to college students, but it quickly expanded to include anyone over the age of 13 with a valid email address. Today, Facebook has over 2.8 billion monthly active users, making it the largest social network globally.