To start, a "Post to Facebook" button has been added to the notification center, right next to the Twitter button. Photos can be posted online quickly straight from the gallery, and location info can be shared without leaving the Maps app. Also, Facebook features have been added to the App Store and iTunes, so users can effortlessly "like" content, such as apps, games, songs, or movies. And if that is not enough, syncing your Facebook contacts has been added, so events and birthdays will appear in the user's calendar. APIs will be made available to developers so that they can take full advantage of the iOS 6 Facebook integration.
Sounds quite promising don't you think? Now feel free to check out a few screenshots of how Facebook integration in iOS 6 will look like.
source: The Verge