Smile iPhone Ap

Surely someone has thought of this. An Ap that let's you tap or shake your phone every time you make a stranger smile.

You get points every time you make someone smile. More points = more levels = more rewards. Smiling is inherently viral.

It would be easy to monetize this but I think of it as cost saving. Think of all our therapy bills. Then again, you could smile at the wrong person and two years later find yourself in therapy, so it's hard to say for sure.