One reason people get radicalized online is that meme culture can quickly reduce issues to a punchline or a call to arms. And by circulating entirely online, with no checks on factuality or origin, memes and the joking around them can convey messages and provoke reactions with none of the back-and-forth that happens in person, let alone the learning acquired through research or deep study.
Something that is not talked about enough.
I agree. I would argue that headlines are passed around almost as easily as memes, though often without the humor element.