26 May 2009
“An interesting deviation from this pattern is observed — a “0-1-2 effect,” in which the probability of joining an activity when two friends have done so is significantly more than twice the probability of joining when only one has done so.”
— Backstrom, L., Huttenlocher, D., Kleinberg, J., and LAN, X. Group formation in large social networks: Membership, growth, and evolution. In Proceedings of the 12th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, 2006.
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