This document provides an overview of key terms and features for several social media platforms, including Twitter, Facebook, LinkedIn, and Delicious. It defines common Twitter terms like hashtags, retweets, and direct messages. It also describes common sections and features of Facebook like the news feed, friends list, groups, photos, and notifications. Key areas and functions of LinkedIn and profile customization are outlined. The document concludes with how to save bookmarks on Delicious and accessing each of the social media platforms on mobile devices.