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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.
Apple's App Store -- where all iPhone and iPad applications are installed from -- is due for a lick of paint. Apple bought Chomp in March suggesting a possible integration of the recommendation software among other features. Beyond all else, it's one of the main features of iOS and could do with some sprucing up. It may include improved search function.
iOS 6 could sport a brand new user interface -- nothing enough to shock even long-time users of the compatible devices -- but enough to keep things fresh. It's understood iOS 6 could lose the blue menu bars in favour of a fresher-looking silver menu instead, according to leaked images of beta developer builds.