The really interesting day from a privacy perspective is the one when you can search and the algorithm will be advanced enough to do even partial face matches o

The really interesting day from a privacy perspective is the one when you can search and the algorithm will be advanced enough to do even partial face matches or even non-face matching identification. There are quite a lot of people who upload photos of themselves to places like /r/gonewild (or send such pseudo-anon photos of themselves through unsecure MMS or email networks) that they think are non-recognizable because they only show the bottom 20% of their face or whatever. IMO it won't be that long until you can plug in a photo of someone and get matches with fairly high degrees of confidence that don't even show the entire face (maybe none of the face at all, if the photos are high enough resolution and the technology gets advanced enough to do real 3D mapping it could be based solely off of small moles or other skin markings on eg. the neck).