Politeness does not help much. Glass and similar gadgets must be set up that by default so that the data is sent to a private webspace owned or rented by the u

Politeness does not help much. Glass and similar gadgets must be set up that by default so that the data is sent to a private webspace owned or rented by the user so that legally no 3rd party can run their queries against it. Users can then buy the terminator app that tells them what shoe and pant size people have - but the actual data must by default be private, everything else is simply crazy. However confronting people and asking them to take off their beloved new toy, maybe one that has prescription glasses built in that they need in this situation, is incredibly difficult in most social situations. Glass-wearing Saruman could laugh at your face, and ask "what do we have to fear?" Only thing Gandalf can do is to throw a blanket over their head and state that the usage of the data is unaccounted for and we don't know who's watching. Awkward imo.