Twitter, the micro-blogging service that can be used to keep you friends up to date on your minutiae or tapped as the hive-mind creates many common social network strands. The site tweetwheel.com makes those relationships visible.
UPDATE: Seems as Twitterwheel had gotten so popular it has overwhelmed its servers. It runs really really really slow or looks like the site has disappeared.
Innanet Growing Painz.
Update of the Update: Bugs seem to be fixed.