> There's something wrong with mainstream reporting if mere exposure to social media turns people far right. It really strikes me that people are trapped in some pretty strong filter bubbles to the point mere exposure is enough to change political belief.

A different conclusion to draw from this is that far-right interests are responsible for the majority of the objectionable content on social media. One might further suggest that said content is deliberate propaganda, designed to push people to the right, and that this is a central pillar of their strategy that isn't shared to the same degree or extreme by other political factions.

This isn't "mere exposure". I haven't read the article so please correct me if I'm wrong but this is a job, a place they go to sit every day to be bombarded with this crap. To some extent they have to sit and let it wash over them—I don't imagine the people doing these jobs have much career mobility. IMO it's not realistic to suggest that if they were just better-informed, they wouldn't suffer these effects. The mind is not an inviolable fortress—no matter how strong you think your defenses are, they can be worn down.