I really don't know. For example, as MVP they could actually manually verify accounts (verify Facebook login, friends on that account, etc.). Also, at the begi

I really don't know. For example, as MVP they could actually manually verify accounts (verify Facebook login, friends on that account, etc.). Also, at the beginning, maybe to allow only people in same city to do transaction. I know it is hard, but somebody much smarter than me could do it.