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4.2.5 Web graph In order to compare the structure of social networks with that of the Web, we made use of data collected by the Stanford WebBase Project [149]. We employed the data from their crawl of November 2003. The crawl includes 8.6 million pages and 132 million hyperlinks collected from over 3900 crawled Web sites. 4.2.6 Summary Our results indicate that • The Flickr and YouTube data sets may not contain some of the nodes in the large WCC, but this fraction is likely to be very small. • The LiveJournal data set covers almost the complete population of LiveJournal, and contains the entire large WCC. • The Orkut data set represents a modest portion of the network, and is subject to the sampling bias resulting from a partial BFS crawl. Moreover, the results also indicate that the vast majority of missed nodes in Flickr, LiveJournal, and YouTube have low degree and are likely to be part of small, isolated clusters. Based on the number of user accounts each site claimed to have at the time of the crawl, we estimate the fraction of nodes our crawls cover in Table 4.1. Note that, unfortunately, we do not know the number of accounts in YouTube and were 67PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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