Sorry about doing this but I often use this blog just to note down interesting links that I find.

Kevin Rose of Digg.com fame tweeted about this site and I think it's quite interesting.  How would a social network look like if it was all mapped out?  Who speaks to each other in the social graph?  The patterns make an interesting visual.

http://socialmediatrader.com/10-amazing-visualizations-of-social-networks/