Valdis Krebs
has a nice article on how to find Visualizing Communities of Interest via Purchase Patterns on the WWW. “One of the cardinal rules of human networks is “Birds of a feather flock together”. Friends of friends become friends, and coworkers of coworkers become colleagues. Dense clusters of connections emerge throughout the social space. The usual pattern found throughout social structures[and many other complex systems] is dense intra-connectivity within clusters with sparse inter-connectivity between clusters.”
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