This is the coolest thing ever. It is a catagorized social media cornucopia of the different platforms, tools and sites available for businesses or individuals. It takes the vast nature of Social Media and brings it down to a well thought out and easy to understand Infographic. It's called the Conversation Prism.
Best viewed by zooming and dragging the screen to see the detail and each logo is clickable so you can jump right to their site (how cool is that - interactive too!).
Brian Solis is one of the co-creators of this Infographic - I have been involved with sponsoring some tweetups in Silicon Valley he attended. Brian knows his stuff and knows Social Media. In the land of Social Media Snake Oil (where eveyone is an expert...) Brian is the real deal.