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71 1.8 million users. This represents, relative to the initial network snapshot, over 129% growth in the number of users and over 173% growth in the number of links. 4.4.3 Wikipedia Wikipedia (www.wikipedia.org) is a popular online encyclopedia that allows any user to add or edit content. Wikipedia makes its entire edit history available on a monthly basis, and we downloaded the edit history of the English language Wikipedia as of April 6th, 2007. To extract the graph of links between Wikipedia pages, we used the following method: for each link in the current snapshot, we determined the time when this link was first created. We then construct a graph using these derived links and the associated timestamps. This method allows us to remove the effects of page van- dalism, where malicious users sometimes overwrite entire pages, thereby temporarily removing all of the links from vandalized pages. Since Wikipedia allows pages to redirect to other pages, we configured our tool to follow the redirects, and treat a link to a redirect page as if it was a link to the destination page. Thus, if page A originally linked to B at time t, but later, B was set to redirect to C, we treat this like a link from A to C established at time t. This allows us to handle multiple layers of redirect pages, as well as large-scale naming convention changes. Since the data represents the complete history of a complex network, we excludePDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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