Has the average person heard of 4-chan? If they had, would they understand it as anything different to Facebook, which they seem to trust, or the comments section under a news story, ditto?

People don’t know what accurate and trustworthy looks like. Even when things are labeled as fiction, they can have an effect - Scotish Independence became more popular when the film “Braveheart” was released, while Islamophobia went up after “American Sniper” was released. Or am I just repeating plausible but fictional urban legends that I’ve mistaken for reality?