I've been playing with Logseq for something similar - using the Zotero integration to share research notes (and sometimes blog). The attributes and queries are super clever, too.

I'm not sure it'll ever replace Facebook/Twitter/et al, but it is nice to have a semi-private network of people who can have grown-up discussions, or express thoughts deeper, or with more nuance, than 100-some characters.

There were only a few Facebook groups that I ever got any value out of, which were mostly small professional groups that banned political bickering. My mental health has definitely improved by going back to old-school forums, and I've noticed a lot of others doing the same over the past year or so - especially with Lemmy, which is maybe even a bit easier to set up.