This document discusses social media and provides examples of different types of social media websites. It notes that social media are internet-based applications that allow users to generate and share content and interact with others. Some examples of social media types mentioned are social bookmarking sites, social news sites, social networking sites, and social photo and video sharing sites. The document also states that approximately 25% of the world's population uses social media and that three-quarters of online users engage with at least one social networking site.