Jacob Goldenberg, Sangman Han, and Donald Lehmann discuss the critical role of "social hubs" in social systems (i.e., individuals with an exceptionally large number of social ties). They point to the importance of identifying such social hubs for accelerating the diffusion of products.
Lehmann, Donald, Jacob Goldenberg, and Sangman Han. "Social Connectivity, Opinion Leadership, and Diffusion." In The Connected Customer. Ed. Stefan Wuyts, Marnik Dekimpe, Els Gijsbrechts, and Rik Pieters. New York: Taylor and Francis Group, 2010.
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