That was a good read and it resonated with me from personal experience. Often the groups I was in were fragmented or I'd be suddenly invited into a second group with someone else removed. Glad it wasn't me, would have been too hard on me to realize I'm suddenly alone in a ghost group.

I wonder what the cut-offs are for "group is too small" and "group is too large", but that certainly depends on the subject the group is about. A philosophy book reading group probably doesn't work well with the bestselling crime novel audience.

Clay Shirky: A group is it's own worst enemy

https://gwern.net/doc/technology/2005-shirky-agroupisitsownw...

This is by far the most pretentious thing I’ve read all week.