The document summarizes social networking and its history. It discusses how social networking sites allow users to create public profiles and connect with others. It notes Andrew Weinreich as the father of social networking and identifies SixDegrees as the first social networking site. The document then provides details on some of the most popular current social networking sites like Facebook, Instagram, WhatsApp, and Snapchat. It gives statistics on their users and founding dates. Finally, it outlines advantages like connecting people and sharing information, and disadvantages such as spreading misinformation and cyberbullying.