Win win win with new technologies!
Or how about, for a small negotiated slice of the action, HMRC team up with FB and they seamlessly collect import/export duties across the EU border on our behalf! That way FB would be on a nice little earner that would go some way to offset the taxation levied on their own UK business! Plus, any non-payers, could find fwends and family getting a knock at the door to cough up whats due! /S