This is a problem that is big now, but I think can also be solved with maturing the technology in the future.
Right now I have multiple accounts for multiple bubbles, but I can easily imagine some app or website that can congregate the content coming from multiple instances and choosing the appropriate account for it to post/view with.
Thus allowing one to access bubbles that have shut each other off in one central place. Unless they do it by completely blocking sign ups in which case they isolate themselves willingly and that is also good in a way to have as an option.
If I can imagine all this as a random system engineer, surely some developers with a passion for this and open source collaboration etc. can too.
Austria: not often and I like that. Not a fan of nationalism, so the less visible this is in my life the better. I see flags IRL mainly on government functions and when right wingers parade around, maybe also near football matches, that‘s about it.
I‘d like to think the history with Nazis made it less popular, but the actual amount of far-right voters makes me think I might just live in a happy little bubble and I’d be shocked if I looked into people‘s cellars.