Yep, if there's a recommendation algorithm and a "this is my megaphone" style posting, it just inevitably becomes an echo chamber of narcissism.

Even Mastodon which has no algorithm trends towards the obnoxious when you start going into various corners.

As much as I hate Facebook now, the OG Facebook which was strictly a feed of "this is what my friends and family are posting" and nothing else... was ideal. Not public. Just private in an inner group.

the much maligned Google+ honestly had a good model too.