The document discusses using social media for professional development. It identifies top social media sites like Facebook, YouTube, LinkedIn and Twitter and explains how each can be used. Twitter is examined in more detail, defining terms like tweets, hashtags, followers and trends. The document recommends using LinkedIn and Twitter for professional networking and development. It provides tips for beginners and advanced users on how to expand their network on Twitter through following others, participating in relevant discussions and using tools like TweetDeck or HootSuite.