The "Why it matters" section is interesting. Cynically I'm trying to think of commercial uses of this for FB. I'm thinking if you built a device that you could

The "Why it matters" section is interesting. Cynically I'm trying to think of commercial uses of this for FB. I'm thinking if you built a device that you could put into public places, restaurants, or stores: * People could order food from their table without summoning a server. I guess some restaurants have tablets or other devices at their table but it seems to break immersion if you're enjoying your company. * In a big box store someone could come help you where you are without having to have workers roam the store and then you hope you run into someone. * Fingerprint people in public or private for targeted advertising.