Back in the beginning when Facebook wasn't stalker friendly I remember wanting to have auto tagging based on facial recognition. Now... now I'm afraid that I'll get tagged by other people in facebook (even though I'm not part of it anymore) and facebook will of course make money by selling all the facial patterns to third parties.
The applications of facial recognition make my mind fly, they remind me of Minority Report and marketers recognizing you wherever you go, it makes me think of even more divorces based on far more evidence that will be automatically available on social networks.
I think I'll start wearing some make-up a few months from now, or turn my face away every time I see a camera. The end of anonymity is near.