Filter bubbles are in. Blue sky and mastodon show that people want to self segregate. Even people remaining on Twitter are happy with the exodus.

Facebook is explicitly pro filter bubble. The community notes will come from your ingroup.

One irony is that diversity in online spaces leads to division. People no matter their politics and interests prefer people similar to them.

One way to look at this is by geography. Think of how a group of non English speaking Africans would talk together.

The other irony is that groups of people view the other groups as not similar to them and want to change them. It's always the outgroup that needs it's filter bubble bursting. It's always the other that is brainwashed.

So the downside of filter bubbles remain: more division, more separation between different people.