I've heard from people working on Facebook's stuff is that it's hilariously inaccurate if it has to choose between more than about 20-30 people. Most of the wo

I've heard from people working on Facebook's stuff is that it's hilariously inaccurate if it has to choose between more than about 20-30 people. Most of the work is spent on figuring out which if your friends is likely in the photo. If you wanted to solve the "identify person on street" problem, you'd probably have to augment it with things like scans of NFC enabled credit cards and phone MAC addresses to know who is in the area -- not an entirely impossible set of sensors to put in a self-driving-car.