Unless your device is jailbroken there are no hacks for iOS reported by any credible securities lab in the world and the SDK for 3rd party developers is very strict to prevent hacking despite the fact they would do this seeing Apple enforces them to identify themselves to Apple in order to develop applications and sell them exclusively through the App Store.
What you are seeing may be a feature of Snapchat which is not developed by Apple Computer. I'd ask them.