The document provides an overview and history of the social media platform Facebook. It describes how Facebook was founded by Mark Zuckerberg at Harvard University in 2004 as a campus social network called Thefacebook. It eventually expanded to other schools and became publicly available. Today, Facebook has over 850 million active users worldwide and generates billions in annual revenue through advertising and other services. The document also discusses how Facebook compares to other social networks and provides tips on using Facebook safely and privately.