The bigger issue, for me, is for things like Facebook gathering data on third-party sites that I had no idea* were feeding the information back to Facebook. An

The bigger issue, for me, is for things like Facebook gathering data on third-party sites that I had no idea* were feeding the information back to Facebook. An even bigger issue, for me, is having my face added to their facial recognition algorithms, despite never once tagging myself in a photo. Is there a way to opt out of this?