Found this nice piece of infographic that explains almost in detail everything about the social media channels, all in one comprehensive, brief picture. 10 social media channels are illustrated here including Twitter, Facebook, YouTube, Linked In, Digg, Stumble Upon, Yahoo Buzz, Reddit and Delicious, where the possibilities and non-possibilites with characteristics of each channel are explained. A must have for every social media enthusiast. Impressive stuff !
Click on the picture to see the full resolution pic.