Key Takeaways:

1) 90%/9%/1% sure holds true across sites. Participation inequity.
2) Beyond Dunbar number, hard to maintain trust.
3) Have different strategies for different participation levels & group sizes

Found this - academic paper on google :
http://209.85.141.104/search?q=cache:sZ_e9TbhRboJ:www.liv.ac.uk/evolpsyc/Hill_Dunbar_networks.pdf+social+network+size&hl=en&gl=ca&ct=clnk&cd=1

good analysis w/ the numbers.
This talk I believe had some very interesting numbers and reference points that are useful to keep in your head if you work in this field. I wish this page were more fleshed out, but I didn't do a good job of fleshing my own session's page out : /

contributed by chas.warner@hidden on Aug 9 2:18pm

Dunbar number on wikpedia : http://en.wikipedia.org/wiki/Dunbar's_number

contributed by chas.warner@hidden on Aug 9 2:21pm

and Chris Allen's blog on how NOT to misinterpret some of these numbers:
http://www.lifewithalacrity.com/2004/03/the_dunbar_numb.html

contributed by chas.warner@hidden on Aug 9 2:23pm