I'm not sure what it's called, but I've seen a product which is a database of the time/location of US car license plate sightings. As I understand it, these are OCR'd from a combination of private, and public footage. I wonder if something similar exists for faces, and if some company is performing facial recognition on publicly uploaded footage. It sounds quite paranoid, however we know for a fact that such technology exists, and that there's a motivation for it.