Yes you asked a question and we answered it. Maybe just don't use your phone in public and you should be fine.
No, I think the solution above will do, but thanks anyway.
It says in this article that there might be something to stop people from looking in future devices: http://www.tomshardware.com/news/iOS-7-WWDC-Game-Center-Jony-Ive-Flat-Design,22323.html