Ok, so it's all ActivityPub. But you did precisely what to follow a lemmy community from Mastodon? Examples would be hugely helpful for those of us who are also using Mastodon!
From an adoption standpoint: is there anything resembling a mapping of Reddit "subreddits" to Lemmy "communities"? It would sure help the migration process for users seeking to stay with their communities!
Though I suppose, perversely, such a directory could also be a target for Reddit. But then having such problems would be interesting (for Reddit).