If your goal is to change opinions, I wouldn't discount reddit. Although certain ideas encounter a strong pushback, one thing people often don't realize is that downvoted comments get attention. People want to see what got downvoted. And not everyone is brave, or foolish, enough to jump into a conversation with mass opposition, but that doesn't mean that some of those lurkers reading it won't be swayed.

I know personally one of the ideas I've had some success with is the notion that Bill Cosby got fucked over by court. Although a generally unpopular notion, I have seen people agree with my points.