I would genuinely like a half-decent camera mounted to my glasses. I mean, it's Facebook so it's going to be bad like all of their hardware products, and it'll additionally be tied to Facebook which is a bad thing, but I'm just saying theoretically I wouldn't mind this category of product.

Mostly I'd use it to "take notes" when I need a quick shot, rather than taking out my phone camera. I can't tell you how many times I've been sketching a proof on a whiteboard and then had to take a phone photo for later reference, and it's just one of those minor inconveniences I imagined I wouldn't have to deal with in the year 2525.

(And yes, I acknowledge that smart glasses are a privacy nightmare and there's any number of negative social externalities)