I don’t have anything to suggest on Lemmy. There’s so little activity that I participate in every community where I see an interesting post, except for those communities which are specifically for people with some particular set of beliefs which I don’t share.

If you’re looking beyond Lemmy, there are are the comment sections of the SlateStarCodex/AstralCodexTen blog and the blogs it links to as well as some associated forums and subreddits. You’ll find plenty of liberal libertarians and the comments tend to be polite and high-effort, but keep in mind that a dedication to free speech means that people with opinions that can’t be discussed elsewhere participate too. It’s a bit much for me sometimes.

I used to call myself a “left libertarian” but to be frank, after learning more I’ve found that “anarchist” fits far better. And there’s a lot of interesting content out there that I enjoy. I’m not sure who all .world has defederated, but the solar punk instance is always great, our mods are great (Midwest social), some people may find them abrasive, but those are people who maybe don’t understand that when you play in someone else’s home, you play by their rules.

Also: blahaj, beehaw, and even hexbear is usually entertaining, even if I have some disagreements with them.

The point is, there’s a lot out there, depending on who you’re federating with.