[hyko]

it doesn't really matter how close the screen is to your eyes

Yeah, I didn't mean to suggest there is a continuous relationship between trust and distance from the eyeballs :) The promise of AR and VR is that there is a quantum leap when your entire field of vision (or a very large fraction of it) is enveloped by the display though.

it doesn't have the ability to control your sense of reality

That's the entire premise of the products – the "R" in AR and VR is about inserting a shim between you and reality. That requires a level of trust I wouldn't be fully comfortable giving to myself, let alone other people, and never FB.