Facebook Integration in iOS 6
 

Facebook in iOS 6 is more heavily integrated. You can now like apps in the app store and see what your friends like. You can now update to Facebook (and Twitter) directly from the notifications menu. Shared contact information from your friends in Facebook now auto populates in your address book on your phone.

http://www.anandtech.com/show/5984/f...ation-in-ios-6