That's only one fragment of social media though, it's not helpful to focus on this part of social media alone; another big one is the rhetoric hidden in otherwise normal / legitimate content that seems to be a nontrivial factor in a hard shift to the right, politically.

the government should not be in the business of regulating social media to ensure that public opinion stays within [A, B] ideological bounds.

for a long time I didn’t think this needed to be said, but now I realize it needs to be said quite forcefully actually