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You can easily see which services have access to your contacts, calendar data, reminders and photos -- as well as your location -- from the Privacy menu. Simply select one and it will tell you which service has access.
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.