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Journal Articles Physical Review Letters Year : 2015

Kinetics of Social Contagion


Diffusion of information, behavioural patterns or innovations follows diverse pathways depending on a number of conditions, including the structure of the underlying social network, the sensitivity to peer pressure and the influence of media. Here we study analytically and by simulations a general model that incorporates threshold mechanism capturing sensitivity to peer pressure, the effect of `immune' nodes who never adopt, and a perpetual flow of external information. While any constant, non-zero rate of dynamically-introduced innovators leads to global spreading, the kinetics by which the asymptotic state is approached show rich behaviour. In particular we find that, as a function of the density of immune nodes, there is a transition from fast to slow spreading governed by entirely different mechanisms. This transition happens below the percolation threshold of fragmentation of the network, and has its origin in the competition between cascading behaviour induced by innovators and blocking of adoption due to immune nodes. This change is accompanied by a percolation transition of the induced clusters.

Dates and versions

hal-01203176 , version 1 (22-09-2015)



Zhongyuan Ruan, Gerardo Iñiguez, Márton Karsai, János Kertész. Kinetics of Social Contagion. Physical Review Letters, 2015, 115, 218702. ⟨hal-01203176⟩
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