Facebook was founded in 2004 by Mark Zuckerberg and his Harvard classmates, initially named "TheFacebook" and available only to college students, before gradually opening up to global users. Its core functions revolve around social interaction: users can create personal profiles, add friends, post text, image and video updates, and access content through the "News Feed" to interact with others. It also supports interest groups, brand pages, live streaming, short videos and second-hand transactions, catering to diverse needs.