[danaris]

The killer app for AR isn't going to be on phones. It's going to come when (and, I suppose, if) the hardware gets small enough that it can be integrated into glasses that are comparable in weight and bulk to current prescription eyeglasses (and, ideally, can actually incorporate prescription lenses, for those of us who need those to see every day).

At that point, the "killer app" becomes the ability to augment your own senses and memory with, for instance, facial recognition that reminds you of who this person is, useful facts you know about them, etc. Or walking or driving directions that are overlaid directly on your view of the actual paths/streets/etc. Or even virtual tours of places—either places you're physically in, or places you're nowhere near, but have a space of comparable size you can walk around in!

The danger, as we saw with Google Glass, is twofold: on the one hand, allowing an unregulated tech titan like Google or Facebook to have access to cameras attached to people's faces; and on the other hand, the fear of allowing anyone to walk around with an always-on (or potentially always-on) camera, whether its recordings ever left the device or not.