You can try to use some common sense. The risk of a security researcher finding out about it, or of a whistleblower coming out is too high. Something like that

You can try to use some common sense. The risk of a security researcher finding out about it, or of a whistleblower coming out is too high. Something like that would not pass a risk-benefit analysis in any stretch of the imagination, specially for a company that already collects huge amounts of data from their users. I don't think this is something Facebook would be able to come back from.