Evidence that Apple is building system-wide iPhone and iPad integration with Facebook, like it already does with Twitter, has been found in the latest beta of iOS 5.1.



From Apple Insider:

Digging through the recently released third beta of iOS 5.1, iMore discovered evidence that Apple could add deep Facebook integration into a future operating system update. In one screenshot shown for the iOS Contacts application, there is an option to enter a person's Facebook user name right below their Twitter account.

System-wide Twitter integration was one of the most-touted features of iOS 5, which was publicly released last October. After its release, signups for Twitter grew by 25 percent.

  iOS 5.1 beta 3 hints Apple is planning deep Facebook integration