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In this case, Twitter has access to your contacts data. You can turn it off, but once the data is in third-parties' hands, it does not mean the data will be deleted from their servers.
The Camera has been updated slightly -- not by much -- but enough to make users smile. When the Camera is in landscape mode, the camera-snapping button rotates so you can see it with greater clarity.
iOS 6 also has a vastly improved sharing screen, allowing users to quickly and simply share data. Facebook is also integrated here. Photos can be assigned to contacts, and other content can be tweeted, Facebook'd, printed and sent via email and iMessage.