true enuf about dunbar's number - I just like the nice easy 150
  (I think the original was really 147 but it gets rounded up -
  been years since I last read up on it). I remember reading
  somewhere (or in several places) about certain important numbers
  when it comes to grouping people. 150 was the limit where you
  really KNOW everybody - that doesn't even mean that 150 is ideal
  but that its the upper... limit but of course it can slide past
  that and would probably still work. I remember something about
  the number 12 - 12 people was the most people in a different
  grouping - man, I have to look this stuff up again. There's have
  to be some fluidity in the numbers, but definitely ranges would
  be necessary. But I have to talk my hexagon idea... "