This document provides an overview of social networking sites. It discusses that social networking sites allow individuals to create public profiles and connect with others. The first social networking site was SixDegrees, which launched in 1971. Some of the most popular current sites are Facebook, Twitter, LinkedIn, Pinterest, Google+, Tumblr, Instagram, VK, Flickr and Vine. The document outlines the founders and users of Facebook, Twitter, and LinkedIn. It concludes with advantages like connecting people and sharing information, and disadvantages such as spreading false information and cyberbullying.