For all my #nsfw friends, start following @thehive and tag them with your #NSFW content. It is a group.

You can join a group by following the group account. You can post to the group by @-ing the group account, which then reposts that to all its other followers

It is similar to the existing https://a.gup.pe system, but chirp.social allows a group manager to delete posts and ban people from the group.