This document provides an introduction and overview of social media platforms Facebook, Twitter, and LinkedIn. [Facebook has over 1 billion users and recently acquired Instagram. It discusses personal accounts versus business pages on Facebook.] [Twitter has over 400 million active users and allows users to post short messages of 140 characters or less with hashtags to categorize content. The document provides tips for setting up and using a Twitter account.] [LinkedIn is the world's largest professional network with over 161 million members. It can be used for networking, finding jobs, and creating company pages. The document provides tips for setting up a LinkedIn profile and getting involved in groups.]