Facebook, Inc. is an American online social media and social networking service company based in Menlo Park, California. It was founded by Mark Zuckerberg, along with fellow Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.
Facebook is a popular free social networking website that allows registered users to create profiles, upload photos and video, send messages and keep in touch.
Source: facebook.com