I'm usually solo. I have a couple of friends that i ride with and feel comfortable with. I'll ride in a pack of 2 or 3. Of course, if the wife is up for it, we go two up.
I have been in larger packs where there's one or two who's ego's are bigger than their bike and let the drama begin. ( not formal rides, just a large neighborhood group)
However....yesterday, a couple of RKC's joined in during my morning scoot/Church. We talked at lights, had a soda at a corner store, shook hands and went our own ways.....good people, good ride.