These technologies will also allow the creepees to monitor the creepers. If someone's taking a rather candid photograph of you, your recording apparatus will also be running, so you can out them. The technology can be used for good (recording acts of oppression, for journalism?) or bad (voyeurism, shaming, the usual police state crap). Russia has dashboard cameras, perhaps we can expect something similar elsewhere. Cyclists have benefited in the past from wearable cameras, when recording dangerous drivers, etc.

It will be interesting to compare how people react to this, compared with CCTV (which already offers a ridiculous level of surveillance, especially in the UK where I live). Would you be more bothered by the person sitting next to you on the bus filming you with a hidden camera, or a dumb black hemisphere on the ceiling taping you?

We've managed so far to avoid confronting the problem of defining privacy, since the surveillance has happened at an impersonal level - all of the cameras in public can be justified by "crime prevention". But when everyone has a hidden camera, what will we call it? Voyeurism? Sousveillance? Journalism?