[fixermark]

<sarcasm>Yes, I'm glad people panicked about Google Glass possibly allowing for this, but by the time Hololens gets to try it, it's inevitable and cannot be stopped.</sarcasm>

[sp332]

Google specifically disallowed apps from doing this (though you could sidelide them I guess), and lots of people complained that it was a useless gesture.

[BinaryIdiot]

I think perhaps you didn't click on the link? This calls the Microsoft Face API and simply returns back attributes about the face you're looking at.