Founded on February 4, 2004, by Mark Zuckerberg along with his college roommates Andrew McCollum, Eduardo Saverin, Chris Hughes, and Dustin Moskovitz. Originally limited to Harvard students, it expanded to other Ivy League universities and eventually to the general public. It's a social networking platform that allows registered users to create profiles, upload photos and videos, send messages, and keep in touch with friends, family, and colleagues.