Those of you who have accounts over at LastFM know about some of the the nifty little perks, like the scrobbling feature that links your account with your iTunes to keep track of play counts and such. They've taken that one step further with social media sites, namely Twitter and Facebook.
Some of you might already know about and use this. It's pretty neat. Through http://www.tweekly.fm/, you can link your Facebook or Twitter to your LastFM account/iTunes and have weekly statistics on your listening habits published to those social media sites. It lists your top three most listened-to artists, including play counts. That way, all followers/friends can see what you're into and praise or question you accordingly.
Admittedly, this doesn't have much of a point and might even be kind of useless. But then again, so are Twitter and Facebook (but I still love them).