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18 tent is spread in today’s networks. Most of the sites we study are designed for sharing content: Flickr, YouTube, and LiveJournal are used for publishing, organizing, locat- ing, and distributing photos, videos, and blogs, respectively. To investigate the role played by the underlying user network in organizing and locating content, we conducted a simple measurement of how users browse the Flickr system. We analyzed the HTTP requests going to the flickr.com domain from an HTTP trace taken at the border routers of Technical University of Munich between August 17th, 2006 and October 11th, 2006. We found 22,215 photo views from at least 1,056 distinct users. For each of these views, we examined the browser’s clickstream to determine what action led the user to a given photo. We found that 17,897 of these views (80.6%) resulted from following links in the Flickr user graph or from following links between photos within a user’s collection. In other words, 80.6% of the time, the social network of Flickr users was used in browsing content. We count these views as being influenced by the social network. Of the remaining, 1,418 (6.3%) views involved Flickr search facilities. Finally, only 2,900 (13.1%) views followed a link from an external source, such as links from an external Web site or links received via email. Neither of the latter sets of views (19.4%) involved the social network. Thus, our experiment demonstrates that the social network in Flickr plays an important role in locating content: four out of five photos were located by traversing the social network links.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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