It’s not about social networks but algorithmic feeds. The same issues pop up with YouTube or any other website that shows you content that it thinks is more likely to engage your attention.
Right, I get that, but the article is heavily weighted towards examples of Elon Musk and the Republicans colluding to shape specifically the feed on Twitter. I agree that it's bad that's happened (in the sense of Twitter is now a much less credible platform as a result), but, again, if you're talking about destabilizing entire democracies you have to account for the fact that Musk has direct influence only over a social network very few people pay attention to.
I agree FOX News is a much more successful tool for pushing a neofascist agenda, but Twitter YouTube and other various individually engagement-tuned sources are recruiting a new audience and helping fragment the consensus on objective reality.
If you believe Biden’s election was stolen, you are likely to have that belief reinforced by low-quality media targeted at you.