So first off Facebook would have to transgress the barrier in place that they say they're erecting between the user's Calibra account and the user's FB or WhatsApp or Insta account – simultaneously Facebook would have to tag its users as holding sets of beliefs that were antithetical to some set of ideal beliefs that would be encoded digitally somewhere inside Facebook's algorithms. To do this without human intervention would be a supreme AI task, to do it without human arbitration would be to blindly trust an algorithm, to do it at all would be an act of tyrannical censorship.

We here at Facebook hope that answers your question.