This document provides a summary of 21 social media tools, including Animoto, Dropbox, Eventbrite, Facebook, Flickr, Foursquare, Google Docs, Google+, Jing, Lanyrd, LinkedIn, Posterous, Prezi, Quora, Scribd, SlideShare, Storify, Twitter, Xtranormal, and YouTube. Each tool is briefly described in 1-3 sentences explaining its purpose and key features. The document aims to help readers make sense of different social media options.