I actively participate in two Yahoo groups for writers and I regularly read, but rarely participate, in a third. I see a significant membership overlap among these three Yahoo groups and, for a time, I worried that there were only a dozen or so truely active short story writers in the world.
I know that isn't true because the three groups I'm involved with are for people who write mysteries and women's fiction. I also write in other genres, but I don't participate in any Yahoo groups or message boards for those genres.
Why not? What draws us to participate in one Yahoo group or discussion board rather than another? Is it the subjects we discuss, or is it the people participating?