I forgot about spacehey! I made an account and never got around to setting it up. Shame it’s not part of the fediverse, though! Myspace had that part where you could, like, post a random letter or something that wasn’t confined to your friends. I can’t remember what it was called. I just remember Mrs. Abnorman Punkrockwell used to post open letters. Lmao. Anyway, it would be perfect for integrating into Mastodon, and Myspace groups would be perfect for integrating into Lemmy.