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Creating Social Contagion Through Viral Product Design: A Randomized Trial of Peer Influence in Networks


Sinan Aral


Massachusetts Institute of Technology (MIT) - Sloan School of Management

Dylan Walker


Boston University

November 30, 2010

Management Science, Forthcoming

Abstract:     
We examine how firms can create word-of-mouth peer influence and social contagion by designing viral features into their products and marketing campaigns. Word-of-mouth (WOM) is generally considered to be more effective at promoting product contagion when it is personalized and active. Unfortunately, the relative effectiveness of different viral features has not been quantified, nor has their effectiveness been definitively established, largely because of difficulties surrounding econometric identification of endogenous peer effects. We therefore designed a randomized field experiment on a popular social networking website to test the effectiveness of a range of viral messaging capabilities in creating peer influence and social contagion among the 1.4 million friends of 9,687 experimental users. Overall, we find that viral product design features can indeed generate econometrically identifiable peer influence and social contagion effects. More surprisingly, we find that passive-broadcast viral messaging generates a 246% increase in local peer influence and social contagion effects, while adding active-personalized viral messaging only generates an additional 98% increase in contagion. Although active-personalized messaging is more effective in encouraging adoption per message and is correlated with more user engagement and sustained product use, passive-broadcast messaging is used more often enough to eclipse those benefits, generating more total peer adoption in the network. In addition to estimating the effects of viral product design on social contagion and product diffusion, our work also provides a model for how randomized trials can be used to identify peer influence effects in networks.

Number of Pages in PDF File: 34

Keywords: Peer Influence, Social Contagion, Social Networks, Viral Marketing, Information Systems, Randomized Experiment

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Date posted: May 30, 2010 ; Last revised: August 30, 2012

Suggested Citation

Aral, Sinan and Walker, Dylan, Creating Social Contagion Through Viral Product Design: A Randomized Trial of Peer Influence in Networks (November 30, 2010). Management Science, Forthcoming. Available at SSRN: http://ssrn.com/abstract=1564856 or http://dx.doi.org/10.2139/ssrn.1564856

Contact Information

Sinan Aral (Contact Author)
Massachusetts Institute of Technology (MIT) - Sloan School of Management ( email )
77 Massachusetts Ave.
E62-416
Cambridge, MA 02142
United States
Dylan Walker
Boston University ( email )
595 Commonwealth Avenue
Boston, MA 02215
United States
HOME PAGE: http://www.dylantwalker.com
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