At present the internet is an open field like a country with no government. Let us wait for the time that a regulatory body will be installed so that there will be an authority. For example if Google will act as the regulatory body it can have a register of all websites that are willing to join the organization. All member sites have real identities of origin and the owners. That will probably stop the scams. Just like the olden days when there was no caller ID on landline phones, the prank calls stopped when their phone number would display on the phone that they called.