Eh. Even folks in my own social circle don't think twice about "checking in" on Facebook with tags on all of their friends, and then posting photos of the event

Eh. Even folks in my own social circle don't think twice about "checking in" on Facebook with tags on all of their friends, and then posting photos of the event as it's happening to Instagram. A not insignificant fraction can't be relied upon not to completely check out of reality for extended messaging sessions. And that's a generation (yikes) past where all the real innovative group sharing stuff is happening (high school). I'm not saying Google Glass, or something like it, will succeed, or that it won't face social obstacles of the kind the author describes. But I'm not at all convinced those obstacles are insurmountable if it provides value.