There are a number of tools in the ever-changing and often overwhelming social media landscape. What follows is a quick review of the major types of social applications.Blogs, in which the user posts content open for comment from readers, are one of the oldest types of social media.Microblogs, where the user is limited to very short updates, have soared in popularity over the past few years.The most well-known of these is Twitter, which limits you to 140 characters per post.Face book, the world's largest social network, is a vibrant personal and professional network, while LinkedIn is a social network with a professional emphasis.In addition to these general networks, location-based social networking such as Foursquare and Face book Places, as well as event based social networking through Meetup and Face book Events, are on the rise.There are a host of multimedia tools such as YouTube for posting videos online, Slide Share for slide presentations and Skype for making online calls worldwide.