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Twitter grew massively following iOS 5's release. It was the first social network to be included with Apple's mobile operating system, despite Facebook having more than six-times the users at the time of its release.
Following Tim Cook's comments that users and developers should "stay tuned" regarding Facebook integration, iOS 6 could include tight Facebook integration just as Twitter was in iOS 5. It would make sense: Apple has to cater to its users and as the vast majority use Facebook, it makes sense to embed it as part of the software.