lemmynsfw.com

• https://www.newgrounds.com/
• https://www.pixiv.net/en/
• https://www.deviantart.com/

These come to mind.

Lemmy

lemmynsfw.com is what it says on the tin. Boatload of nsfw communities.

Also, a lot of nsfw sites have forums bolted on if you're really into that sort of thing.

Uuuhhhh... Literotica?

Danbooru if you're into hentai

I hate reddit as much as the next person but it is the NSFW winner.

Fetlife

Uh, social media? Would forums count as social media? What about boorus (plenty of specialized ones, like e6 for furries, sankaku for AI and reposts without tags)?

I know you can find all sorts of NSFW groups on telegram, with a significant portion being scammy. I suppose you could also look for ERP guilds in MMORPGs

When I asked a similar question about old forum websites a while back, someone mentioned the Somethingaweful forum as still being active.

There's probably a ton of NSFW sites with forums that are barely active.

Imaglr is a relatively new one, part of the still attempting to migrate from the original Tumblr Exodus 😂

Not social media but https://www.pornpics.com/ has plenty of pics.

https://bdsmlr.com/ but as you can guess it's mostly bondage photos and videos.

Fetlife?