NWC Members Alex Shapiro and Zach Parness run TouchGraph, which does amazing visualizations of social networking data.
They just released a new visualization, using publicly visible data, on who met who using Hashable at SXSW.
It’s pretty damn awesome. Check out his post here: http://touchgraph.com/news
And go right to the awesome visualization engine thingy here: http://touchgraph.com/assets/applet/navigator/hashable.php?initial_id=ytsirklin