Sorry to be slow to reply, just back from out of town.
For “official” QS community we’re going to stick to our very flexible, free, open-source provisioned, @Dan_Dascalescu supported, Discourse forum.
But by official, this just means: a smallish group of experienced self-researchers have accounts here and check the forums regularly, and generally have shown themselves to be really welcoming to anybody who passes through looking for answers, support, or ideas for tools and methods. Plus, I try to moderate responsibly, and keep the spam out.
That said, anybody is welcome to start other channels, please do it and share your knowledge! r/QuantifiedSelf has 14.6k members and I look at it regularly, and I don’t even know who started it.