A Completely Unscientific Pie Chart Of Who Uses Twitter And Why

The people over at made pie charts describing the users of all the major social networking sites, and one I've never heard of called "Propeller." I am partial to the Twitter diagram that explains the circuitous (and slightly ridiculous) usership (is that a thing?) of the latest in a long series of sites designed to help people share what's left of their private lives with the world.