Ever wondered how much your Twitter network has in common with someone else's? Now it's easy to find out. Just enter two Twitter usernames (the first of which will probably be yours), and we'll tell you how many followers and friends there are in common.
Why might this be useful? (1)
Just joined Twitter? Feel like you might be missing out on a party somewhere? Well, if someone's told you how great Twitter is, enter your name and theirs - and see how their following compares to yours.
Why might this be useful? (2)
News spreads like wildfire on Twitter. The 'retweet' rocks. But are you retweeting to people who already saw the original? Use Twitterlap to check that you've got enough unique users to spare that social embarrassment!
Twitterlap