I think it's non-obvious that Facebook's only following consumer demand here. People are on FB for lots of reasons, including network effects that are hard to c

I think it's non-obvious that Facebook's only following consumer demand here. People are on FB for lots of reasons, including network effects that are hard to change, and the company probably has a lot of leeway to alter its bubble without changing that. Indeed, they've already made many changes. There's also a lot of possible variation in the strength of the bubble. Suppose I click on "Fox News". Should FB feed me more right wing news? Probably: as you say, people want news they are interested in, perhaps for good reasons. Should it try feeding me more extreme stuff, to see if I'm interested in QAnon? Maybe not, but it's easy to imagine how recommender algorithms could end up doing that.