Depends on what you want? Tumblr had refugees due to the war over Porn (or LGBTA erotica). Then someone bought it, and it's okay? IDK. I get lost on Tumblr and gave up. It's also a copyright quagmire, hence the reason it ran into issues. LJ? You don't own your content and they can do whatever they want with it, including delete it without telling you. I read the English translation of the Russian Contract. So, another copyright quagmire, but even worse. Facebook? It's Zuckerberg.
Twitter? Musk. Bluesky? the guy who created Twitter and sold it to Musk and is still beta testing. Instagram (not a writing site - a picture site). Reddit...a lot of fans use it. I follow X-men fans on it, but it's painful. Quora...sigh. Mastodone...possible, it has private groups, but you have to subscribe to each one - which is more work that I want to do. Ao3 - isn't a discussion site, so much as an archive - and it has issues galore.

honestly, I miss LJ in its heyday, also Voy, and Yahoo newsgroups.