If Lemmy and Mastodon continues to get popular, we will eventually get Instance wars.
If the descentralization of social networks continue, we will have to prepare for the eventual rise of the instances wars, where people will start to fight about which instance is better and which one is weird to be in and so on, but that's for the future of us all.
Can we just go back to BBS where you have dial in with your land line to post on a board? The difficulty of use acted like an awesome protection from any community growing too large too fast and was super easy to moderate. I just want to pull my socks up to my knees, yell at the clouds, and dial in to the NG BBS...
I seriously was thinking the other day I need to see if newsgroups we're still a thing. It was so cool being able to dial up, refresh the threads and then read offline at any time without having to refresh or navigate multiple 20mb web pages.... That meme the other day about scraping got me jonesing for barbones simplicity.
(Disclosure: Assuming you're talking about Usenet newsgroups here.)
They are, and I'd say it's reasonable to call it an echo chamber.
Anything to do with politics tends to border on extremism less common on the "regular" internet.