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We live in a world where a tweet can be instantly retweeted and read by millions around the world in minutes, where a video forwarded to friends can destroy a political career in hours, and where an unknown man or woman can become an international celebrity overnight. Virality: individuals create it, governments fear it, companies would die for it. So what is virality and how does it work? Why does one particular video get millions of views while hundreds of thousands of others get only a handful? In Going Viral, Nahon and Hemsley uncover the factors that make things go viral online. They analyze the characteristics of networks that shape virality, including the crucial role of gatekeepers who control the flow of information and connect networks to one another. They also explore the role of human attention, showing how phenomena like word of mouth, bandwagon effects, homophily and interest networks help to explain the patterns of individual behavior that make viral events. Drawing on a wide range of examples, from the Joseph Kony video to the tweet that spread the news that Osama Bin Laden was dead, from the video of Homer Simpson voting in the US elections to the photo of a police officer pepper-spraying students at the University of California Davis, this path-breaking account of viral events will be essential reading for students, scholars, politicians, policymakers, executives, artists, musicians and anyone who wants to understand how our world today is being shaped by the flow of information online.

This study examines the behavior of influential political blogs (conservative and liberal) in reference to external viral content during March 2007 and June 2009. We analyze homophily and cross-ideological (heterophily) practices. We propose a multidimensional model that employs both qualitative and quantitative methods for examining homophily behaviors by looking at three dimensions: blog-to-blog, blog-to-video, blog post-to-video. Findings show that while homophily patterns prevail, some limited occurrences of cross-ideological practices exist. The cross-linking practices may include deliberative motives, but in essence they are not created for the purposes of discourse. Instead, these cross-linking practices strengthen previously held political stances of the users who create them and negatively portray and reframe content of alternative views. This represents homophily in the guise of cross-linking.

AbstractThis empirical study addresses dynamics of viral information in the blogosphere, presenting a new methodology which enables the capture of dynamism and the time‐factor of information diffusion in networks. Data was gathered on nearly 10,000 blogs and 13,000 blog posts, linking to 65 of the top U.S. presidential election videos that became viral on the Internet between March 2007 and June 2009. The article argues that the blogosphere is not monolithic and illuminates the role of four important blog types: elite, top‐political, top‐general and tail blogs. It creates a map of the 'life cycle' of blogs posting links to viral information. It shows that elite and top‐general blogs ignite the virality process, which means that they get the chance to frame messages and influence agenda setting while top‐political and tail blogs act as followers in the process.