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4.2.3 Orkut The next site we examined is Orkut (www.orkut.com), a social networking site run by Google. Orkut is a “pure” social network, as the sole purpose of the site is social networking, and no content is being shared. In Orkut, links are undirected and link creation requires consent from the target. Since, at the time of the crawl, new users had to be invited by an existing user to join the system, the Orkut graph forms a single SCC by definition. The Orkut data considered in this thesis was collected during a crawl performed between October 3rd and November 11th, 2006. Because Orkut does not export an API, we had to resort to the bandwidth-intensive process of HTML screen-scraping to conduct our crawl. We obtained group information in a similar manner. Crawl- ing Orkut presented other challenges, as Orkut limits the rate at which a single IP address can download information and requires a logged-in account to browse the network. As a result, it took more than a month to crawl a total of 3,072,441 users, at which point we stopped. This subset of the entire network corresponds to 11.3% of Orkut’s user population of about 27 million users at the time of the crawl. The Orkut data considered in this thesis, therefore, is limited to this connected component and disregards all links from this component to other, uncrawled users. Because our Orkut data set contains only a sample of the entire Orkut network, there are two potential concerns with the representativeness of the data. The first concern is whether the 11.3% subset of the network we gathered would be similar to 64PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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