At Chirp Conference, Google released an experimental Google Labs service called “Google Follow Finder” to help you expand your Twitter network – “just enter your Twitter account name and you’ll see a list of people you might be interested in following. You can also get interesting suggestions by entering other Twitter user names. If you see someone you want to follow, just click “Follow on Twitter,” log in, and they’ll be added to your following list in Twitter. This integration is based on Twitter’s new @anywhere frameworks, which make it easy for any site to add Twitter functionality. The lists in Google Follow Finder are generated using public following and follower lists on Twitter. For example, if you follow CNN and the New York Times on Twitter, and most people who follow CNN and the New York Times also tend to follow TIME, we'll suggest TIME as a “Tweep you might like.” The list of “Tweeps with similar followers” is simply a list of accounts with similar follower lists to yours,” explain Google.
More info: Google Follow Finder