A couple fandom communities:
- [email protected] - Currently airing show, has weekly discussion threads
- [email protected] - Show that will be airing this fall, has threads for manga chapters
- [email protected] - Show that aired a couple months back, currently mostly fanart posts
- [email protected] - Show that aired a couple months ago, currently mostly fanart posts
- [email protected] - Community to discuss Japanese anime voice actors behind the scenes and share clips
A lot of the anime-related communities have consolidated over time to the ani.social instance. There are historical reasons for this (largely due to hostility from the ml admins), and if you want a brief history for just the general anime community, I previously wrote a post here.
That being said, the ani.social instance has been growing with new communities being added. Here are the more active ones:
General Communities
Series-Specific Communities
Misc.