This document discusses famous social networking sites. It begins by defining social networks and how social networking applications facilitate new connections between individuals for personal or business reasons. It then provides statistics on social networking site usage. The main body details the top social networking sites like Facebook, WhatsApp, Instagram, Twitter, Google+, Skype, Pinterest, LinkedIn, and Telegram. For each site it provides a brief description and their number of active monthly users. The document concludes by discussing some positive and negative effects of social networking sites on education, employment, communication, and privacy.