I don't really enjoy the facebook groups, but the best ones i've found are -
Rouge Printers
Screenprint Q&A
And then the Discord group for the Shirt Show is good -
https://discord.gg/F5hgUAQYRuIt's searchable like the boards are and easier to use than the FB group in my opinion.
I'll still hope for the Ink Kitchen merger to work out, the board format is still my preference