Facebook is a social networking website launched in 2004 by Mark Zuckerberg and his Harvard classmates. It allows users to chat, share photos and videos, play games, and connect through groups and events. The document provides tips for staying safe on Facebook, such as keeping private information private, using strong passwords, and adjusting privacy settings. It also lists additional resources for internet safety. Facebook allows free communication between friends and for finding people with shared interests, though it should be used in moderation and for positive purposes only.