BBC - Facial recognition: Shop where everybody knows your name December 8, 2014

Imagine walking into a shop you've never been in before, to be greeted by name by a sales assistant you don't know.
 
If you're David Beckham or Lily Allen you may be used to this type of VIP treatment, but if your fame is more limited, or even non-existent then you might find this attention rather disconcerting.