There are quality platforms that have communities - see micro.blog, see news.indieweb.org, see my own directory to the modern web at href.cool. These are smaller communities - but they are all outside of the login walls, so there is a lot of crosstalk. There is even a strong community of TiddlyWiki users who congregate around philosopher.life. There are fantastic options out there, if you are able to shift your gaze away from the clickstreams.