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A simple model of stability in critical mass dynamics

In collective behaviors with strongly self-reinforcing dynamics, incentives to participate increase with the number of participants, such that incentives are highest when the full population has adopted the behavior.

Emergence of Spontaneous Social Norms

How do norms emerge? In small groups, people have complete knowledge of one another’s behaviors, making it relatively easy to create shared expectations.

Networked Innovation

Do efficient communication networks increase collective intelligence? Scientists, engineers and strategists all work within highly connected environments where each person’s solutions are used to inspire and inform the work of others.

Collective Intelligence

Decentralized networks offer enormous potential for crowd-sourced information aggregation, whether it takes the form of emergent market forces or a deliberative organizational process.

Birth Control Connect

Exposure to women using a novel method of contraception has the potential to influence contraceptive beliefs, and ultimately an individual’s decision to use contraception.


Sedentary lifestyle is an escalating national and global epidemic that has commanded increasing attention from health care professionals and social scientists.

Origins of Networks

Recent research on social contagion has demonstrated significant effects of network topology on the dynamics of diffusion. However, network topologies are not given a priori.

Complex Contagions

The strength of weak ties is that they tend to be long—they connect socially distant locations, allowing information to diffuse rapidly. The authors test whether this “strength of weak ties” generalizes from simple to complex contagions.

Spreading Behavior Online

Harnessing the new opportunity offered by social media, our research pioneered the use of online technologies to investigate the effects of social structure on the spread of health behaviors.