Quite a few iPhone users are feeling betrayed after discovering that their phones are storing data about their movements and places they’ve been visited. Number of blogs and sites  have already covered this issue in terms of privacy and I’m not going to repeat that.
But what I would like to point out is that if there’s already that sort of data available, why not use it for something useful? If some research group would pick up this opportunity and formulate it into some really cool research project it would be actually fun way to use this backdoor which is provided us by Apple.
For some reason I’m sure that Apple isn’t an only one who is storing data without telling to end users.