Come join the GrapheneOS community on IRC at #grapheneos on Freenode (irc.freenode.net)! It's quite active already and includes privacy/security topics beyond GrapheneOS as long as they're relevant such as microkernels, safe languages, HSMs, hardware wallets and lots more.
Conversation
I tried without much success to move over the community from the nearly completely dead legacy IRC channel using the obsolete branding for the project. There are still 200 people idling over there... it's quite sad lots of the old community isn't even aware the project continued.