>I don’t agree that belief in pseudoscience, rumor, or superstition is anymore prevalent than it was before social media. I think it’s just more visible to everyone how many people do believe wacky ideas.
I think this is a key point. In particular I think educated people (for want of a better term) are often dangerously out of touch with how many people (particularly internationally) don't share their worldview. I remember the first time having dinner with a family and finding out I was the only person at the table who believed in Darwinian evolution. I was shocked because these people weren't even particularly religious. Up to that point, except for strict religious people I don't think I'd even spoken to someone who didn't believe in evolution. Or at least, it never came up.
And this is the point really - what social media does do is increase social friction on these topics. I worked with a guy who didn't believe dinosaurs existed (also not religious). After the initial debates it was fairly easy to just let it rest since he was a nice guy and completely sane on all other topics. But if this had been on social media if I had seen anti-dinosaur posts on a regular basis that would probably have got to me eventually and I would have blocked him. Even though, in social terms it doesn't matter if he believes in dinosaurs or not.
The other thing it does is make people feel less embarrassed of holding particular viewpoints. Lots more people than you might think believe in witches and curses but (quite rightly) think they'll be ridiculed if they discuss this too openly. But if you're on a Facebook group where everyone believes in witchcraft it starts to feel like a legitimate opinion. And then someone else sees one of your pro-witch posts and suddenly there's a discussion about where all this new belief in witches came from. This kind of conflict drives a shitload of activity and makes everyone involved feel bad one way or another.