'Nebul.us is an online application, currently in private beta, that aggregates and visualizes your online activity. Enter your information for Twitter, Facebook, Flickr, etc and install a plugin in Firefox to record your browsing behavior. Get something that looks like the above, sort of a donut-polar area chart hybrid. Nebul.us calls it a cloud.
While your personal cloud can be interesting to a small extent, the strength of Nebul.us will most likely come out of the social aspect. There's a social cloud to see your friends' activity and then there's a public cloud that lets you see what's trending across the network.'

On the early stage is very difficult to say if it would be better/clear then other visulaizations or not.

http://nebul.us/

found via http://flowingdata.com/