The iPhone selfie camera changes the physical appearance of the user to appear more attractive. I wonder if every selfie will have to have a notifier.
Advertising is an act of speech, but it is also an act of trying to get someone to buy something, and that act can be constrained by law.
If you wanted to regulate the iPhone camera issue, I suppose regulating Apple would be the only way to go about it, though I'm not sure if that's a good idea or not.