Or what if I sold my device to someone else. Does that mean they can login as me with my old phone and udid?
Now, I had Fruit Ninja installed, and I had signed up for openFient.. and approved the facebook connect.
Imagine my surprise when a day later - my friend installed Fruit Ninja - so not only did it log me in, it also published to my facebook wall as me. Ended up revoking permissions - something which I should have done, but forgot to do so.