A wealth of emerging data signals a profound shift in our understanding of “contagion.” Traditionally, there are two different paradigms of contagion – On the one hand, researchers have long discussed the concept of contagion from a physiological perspective – someone involuntarily transmits and/or contracts something. On the other hand, marketers are increasingly focused on the social process of “viral” marketing – the means through which consumers consciously and voluntarily virally pass along opinions and attitudes regarding products or services. We now see an emerging hybrid of these two paradigms – an involuntary social contagion developing among people whose interpersonal, psychological and attitudinal characteristics are being passed virally along to others with little or no conscious awareness that it is even happening.
Perhaps most profound is the reality that this social contagion will only increase as social networking and personalized mobile technology continue to become more ubiquitous. The sheer volume of people’s interpersonal connections is increasing by the second; People now have many more surface-level and/or indirect connections than they ever had before. This could be complementing or even replacing the traditional notion of having fewer, but deeper, interpersonal connections. As a result, the average person’s network of “exposure” for social contagion is becoming wider – and connections that lie on the
periphery of that person’s network may still represent a vehicle for social contagion.
Emerging evidence of this dynamic includes the following:
Loneliness can spread among people. People likely catch the loneliness “bug” through negative interactions. An odd look or phrasing by a friend that would not even be noticed by a happy person could be seen as an affront to the lonely, triggering a cycle of negative interactions that cause people to lose friends.
Self-control is contagious. Watching or even thinking about someone with good self-control makes others more likely to show the same restraint, and the opposite is true as well. People tend to mimic the behavior of those around them, and bad habits such as smoking, drug use and obesity tend to spread through social networks. Thinking about someone who exerts self-control by regularly exercising, for example, can make someone more likely to stick with their financial goals, career goals or anything
else that requires self-control.
Blaming mistakes on others is socially contagious. Simply watching someone defer responsibility for their failures to someone else can make a person do the same to protect their own self-image. The result can be detrimental to everyone involved, particularly in the workplace. In organizations where blame is the norm, group members are likely to be less creative and perform poorly.
There is now even evidence surfacing that people exhibit similar physical traits (e.g., obesity) to those people who are as distant as third-degree connections on social networking platforms like Facebook. The implications for this are profound. Regardless of any variables of chance or causality, the fact that people’s physical traits — and thus the underpinning lifestyles/behaviors — show correlation out to the 3rd degree on ubiquitous platforms like Facebook suggest that social contagion is potentially a very powerful force.

