My buddy Clay Hebert (http://twitter.com/clayhebert) just added Tennis to “Sport I Play” on my Facebook profile. Yes, you read that right. You can now (depending on privacy settings) add interests to your friends profiles (similar to how you can check them in to Facebook Places).
Clay was right. I do play Tennis. So I do not mind, but there will be some abuse here. However, it really opens up your Facebook profile. Your friends can now help define you or describe you in a big way. I can see people loving this, but more than likely most will hate the fact that it is opt out.
Update [12/5/10 18:50 EST]: In trying to replicate this it appears it only currently applies to sports. But this is clearly now a trend by Facebook of opening up your profile and activity to input from your social graph.
Update [12/5/10 19:30 EST]: If you want to try this out. Go to edit your new profile, add a sport, and Facebook will give you an option to add who you play the sport with.