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Saturday, September 14 • 9:15am - 10:15am
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“Going Viral” and the Structure of Online Diffusion

Abstract: New products, ideas, norms and behaviors are often thought to propagate through a person-to-person diffusion process analogous to the spread of an infectious disease. Until recently, however, it has been prohibitively difficult to directly observe this process, and thus to rigorously quantify or characterize the structure of information cascades. In one of the largest studies to date, we describe the diffusion structure of billions of events across several domains. We find that the vast majority of cascades are small, and are described by a handful of simple tree structures that terminate within one degree of an initial adopting “seed.” While large cascades are extremely rare, the scale of our data allows us to investigate even the one-in-a-million events. To study these rare, large cascades, we develop a formal measure of what we label “structural virality” that interpolates between two extremes: content that gains its popularity through a single, large broadcast, and that which grows via a multi-generational cascade where any one individual is directly responsible for only a fraction of the total adoption. We find that the very largest observed events nearly always exhibit high structural virality, providing some of the first direct evidence that many of the most popular products and ideas grow through person-to-person diffusion. However, medium-sized events — having thousands of adopters — exhibit surprising structural diversity, and are seen to grow both through broadcast and viral means. Finally, we show that our empirical results are largely consistent with an SIR model of contagion on a scale-free network, reminiscent of previous work on the long-term persistence of computer viruses. 

Speakers
avatar for Sharad Goel

Sharad Goel

Senior Researcher, Microsoft Research
Sharad Goel is a Senior Researcher at Microsoft Research – New York City, where he works in the general area of computational social science, an emerging discipline at the intersection of computer science, statistics, and the social sciences. He is particularly interested in large-scale empirical analyzes that address questions motivated by sociology and economics. Sharad holds a PhD in Applied Mathematics and a Masters in Computer... Read More →


Saturday September 14, 2013 9:15am - 10:15am
ROWE 1020

Attendees (35)