The worst ones are all private, so they can't be pointed to. But we do find out about their existence after they're broken up (by law enforcement action, not Fa

The worst ones are all private, so they can't be pointed to. But we do find out about their existence after they're broken up (by law enforcement action, not Facebook). E.g. the domestic terrorists that were planning to overthrow the Michigan State government were coordinating via private Facebook group. So there's one example for you.