[throwawaywego]

Give me physical opt-out. A "robots.txt"/do-not-track for computer surveillance spiders. Let me wear a necklace or QR code on my shoulder, and any commercial face tracking software, is required to create a big black blindspot where my facial micro-expressions used to be.

[stordoff]

And then the minute it even isn't slightly visible, Facebook et al will likely take that as you consenting.

[johnday]

The implication that everyone is forced to do something, forever, in order to not have their privacy violated, is a little silly. Explicit opt-ins should be the only legal method.