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66 This has been shown to overestimate the average node degree and to underestimate the level of symmetry [18]. Thus, our results may not be representative of the Orkut network as a whole. 4.2.4 YouTube YouTube (www.youtube.com) is a popular video-sharing site that includes a social network. The YouTube data we present was obtained on January 15th, 2007 and consists of over 1.1 million users and 4.9 million links. Similar to Flickr, YouTube exports an API, and we used this feature to conduct our crawls. YouTube allows links to be queried only in the forward direction, similar to Flickr. Unfortunately, YouTube’s user identifiers do not follow a standard format,4 and we were therefore unable to create a random sample of YouTube users. Also, YouTube does not export group information via the API. Instead, we obtained group member- ship information by screen-scraping the HTML pages attached to user profiles. Because we were unable to crawl reverse links or estimate the size of the user population in YouTube, we advise the reader to be cautious in extrapolating the YouTube results to the entire YouTube population, as we do not know the number of users who do not participate in the social network. 4YouTube’s user identifiers are user-specified strings.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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