I know a gentleman through the sport of boxing. He and I are friends on FB. He is a red-neck republican, and as the elections approach, he posts more foolish shit. I view his as a good guy, just not particularly intelligent. A few weeks ago, I started responding to his posts, at about a one-out-of-three frequency. I wasn't saying, "You are wrong," as that would only result in defensiveness. Instead, I patiently documented that his source was inaccurate. Within a few days, some of his other friends started doing so, too. And he now responds by thanking us for pointing out his sources were wrong, and thanking us for correct information.

I could be wrong, but I suspect the best way to reach people like him is to do so individually. Groups are more difficult to reach most of the time. But even then, if we talk to individuals within the group, it is possible. That's why I love "To Kill a Mockingbird."