The most active place for related discussion is Discord - The Board Room where many of the active CHIP community members hang out and discuss all that might be of interest (SBCs, microcontrollers, 3D Printers, Gaming, Slavic Rock and more).
There's also a quieter Discord - NTC unofficial that's aimed more at ongoing CHIP related discussion.
There's an official(ish) IRC channel on freenode called #chipsters. There is a web interface for this but at times this may not work too well as there has been some SPAM on the channel. To talk you might need to register and identify yourself with NickServ