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207 be indexed by our proxy. The remaining requests consisted of images, javascript, and other miscellaneous types. Given that our user base is small, includes the authors, and represents a single community with highly specialized interests, we cannot claim that our results would be representative of a deployment with a larger, diverse user base. However, we believe our results indicate the potential of social network-based Web search. 9.2.4 Limits of hyperlink-based search Even the best Web search engines do not index content that is not well linked to the general Web or content that is not publicly available. So, our first goal is to understand and quantify the Internet content that is viewed by users, but is not captured by the search engines. We would also like to know how much of this content is already indexed by another user in PeerSpective. To estimate the limits of hyperlink-based search, we check what fraction of the URLs actually visited by the users are not indexed by Google. There are a number of reasons why a page may not be indexed by Google: (a) the page could be too new, such a as blog posting or news article; (b) the page could be in the deep web and not well-connected enough for Google to choose to crawl it; or (c) the page could be in the dark web, where it is not publicly available or is not referred to by any other page. For each HTTP request, we checked whether Google’s index contains the URL, and if some peer in PeerSpective has previously viewed the URL. Since search enginesPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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