TweetWheel
If you use twitter you may find this site useful and interesting.
Essentially it draws a relationship circle between you and your friends. As you hover over a follower its shows you who else follows (or has a relationship) with that person. Clicking on the person will open their profile. Here is my Tweetwheel. Simply type in the url (http://www.tweetwheel.com/) with your tweeter id after it (http://www.tweetwheel.com/achurches)
