What is the nature of news on YouTube? What types of events “go viral” and attract the most viewers? How does this agenda differ from that of the traditional news media? Do the most popular videos on YouTube tend to be videos produced by professional news organizations, by citizens or by political interest groups or governments? How long does people’s attention seem to last? The Pew Research Center’s Project for Excellence in Journalism examined 15 months’ worth of the most popular news videos on the site (January 2011 to March 2012)-some 260 different videos in all-by identifying and tracking the five most-viewed videos each week located in the “news & politics” channel of YouTube, analyzing the nature of the video, the topics that were viewed most often, who produced them and who posted them. The data reveal that a complex, symbiotic relationship has developed between citizens and news organizations on YouTube, a relationship that comes close to the continuous journalistic “dialogue” many observers predicted would become the new journalism online.