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Clicking on the Twitter button in the Notification Center, you can quickly and easily send a tweet without fumbling around looking for the Twitter app, or needing to go into multitasking mode.
iOS 6 now has incoming call options to allow users to reject phone calls -- including FaceTime calls -- with a text message or iMessage.
Simply slide up the screen and the options appear. Users can reply with a message, or set a reminder to call them back later.