Following on from yesterday's post on the CMU/Microsoft research, there are two networks in the research: the buddy network and the communications network for that month.
The buddy network has 240 million nodes with 9.1 billion edges. Which equates to 75 contacts per node/person (9,100,000,000 x 2 / 240,000,000). This is an indicator of the size of an individual's weak-tie / acquaintance network.
The communications network has 180 million nodes with 1.3 billion edges. Which equates to 14 contacts per node / person (1,300,000,000 x 2 / 180,000,000). This is an indicator of an individual's strong-tie / tribal network.
How do these results link to the second and third of Dave Snowden's magic numbers?
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Christopher Allen has some very good discussions of the Dunbar Number in a virtual environment (he was looking at online gaming), and suggests that 150 is an upper limit where there are strong incentives to remain together... in weaker social environments, group size plateaus at much lower numbers.
http://www.lifewithalacrity.com/2004/03/the_dunbar_numb.html
http://www.lifewithalacrity.com/2005/02/dunbar_triage_t.html
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