Hello,
power-laws or, more generically, wide distributions of group sizes can be present in many social systems. However, assuming a direct proportional agglomeration in the dynamics of the model may fall short to describe all the characteristics of the group evolution. Here there is a model in which heterogeneity is added to a Simon-like "richer-get-richer" dynamics to explain the variability of growth rates for the social groups in Flickr:
Przemyslaw A. Grabowicz, Victor M. Eguiluz
Heterogeneity shapes groups growth in social online communities
EPL 97 28002, 2012,
Best,
Jose
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Jose Javier Ramasco email: [log in to unmask]
IFISC (CSIC-UIB), http://ifisc.uib-csic.es/jramasco
Edifici Inst. Univ. Recerca,
Campus Univ. Illes Balears, fax: ++ (34) 971 173 248
07122 Palma de Mallorca, Spain. phone: ++ (34) 971 259 886
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