Jon Kleinberg recently won one of the so-called MacArthur Genius Awards from the MacArthur Foundation. The award was announced in September, but I didn't notice that Kleinberg was a winner until just now.

You may remember Kleinberg from Six Degrees or from David Liben-Nowell's recent talk. I see that the Wikipedia has a nice entry on the Six degrees of separation.

Here's a site that has a bunch of different visualizations of social networks. Well worth a look.