This seems like an unusual experience to have. I have played Mafia with 3+ non-overlapping groups in person and 4+ non-overlapping groups online, and have yet to encounter any trouble; in fact, in two of the cases we were explicitly playing as a bonding exercise to improve group morale and cohesion, and it seems to have worked both times.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
If continuing the discussion becomes impractical, that means you win at open threads; a celebratory top-level post on the topic is traditional.