Originally Posted by Zorak

These are all mostly ad hoc though, for coordinating group activities during a specific weekend or FlyerTalk DO, and generally see no traffic once the event/weekend/meetup is over.

Whereas I think OP may be asking about groups for continuous/ongoing discussion of topics like manufactured spending or hotel BRGs etc. In which case, no, I don't think there are any such active discussions officially affiliated with FlyerTalk. (I forget if there may have been an official chat function in the past)

Vaguely related: FlyerTalk Discord