Gregory's Server
I advocate 2 locations as place-to-be for helping #ActivityPub and #Fediverse move forward.
Yes, the #W3C #SWICG for the AS/AP open standards tracks and mailing list discussion. But also the #SocialHub where #FEP's are discussed and a huge archive of dev discussion is collected.
For years they went hand in hand re:collab, then the SWICG turned inactive while the forum did not. Now looks like there's some split happening.