The history of social networking began with early humans sharing information through cave paintings. In the 1970s, the first email was sent, marking the beginning of digital communication. Bulletin board systems in the 1970s allowed users to upload and share files and messages online. Early social networking sites in the 1990s like GeoCities and SixDegrees allowed users to create profiles and connect with others. Popular social media like Friendster, MySpace, Facebook, and Twitter launched between 2002-2006, helping social networking grow exponentially. Today the largest social networks like Facebook have over 800 million active users worldwide.