But returning social interactions to the public sphere isn't going to entirely fix the dissemination of fake news or suddenly pop the filter bubbles we live in.

But returning social interactions to the public sphere isn't going to entirely fix the dissemination of fake news or suddenly pop the filter bubbles we live in. It doesn't need to be entirely fixed. There's no need to let the perfect be the enemy of the good. I think that the "private infrastructure posing as public space" is a real and serious problem. When all complaints of censorship/manipulation/etc on a social media site of any reasonable size is thoughtlessly brushed aside with "their site, their rules", that is a very unhealthy environment being created.