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70 observed over 10.7 million new links being formed and discovered over 680,000 new users. This represents, relative to the initial network snapshot, over 42% growth in the number of users and over 63% growth in the number of links. 4.4.2 YouTube We crawled the YouTube network daily between December 10th, 2006 and January 15th, 2007, and again daily between February 8th, 2007 and July 23rd, 2007, rep- resenting 201 days of growth. Between the two date ranges of our crawls, YouTube changed its policy to require confirmation from the destination of a link (previously, this approval was not required). Thus, between our two observation periods, YouTube changed from a directed network to an undirected network. To properly analyze the data before and after this significant change in policy, we treat the two YouTube net- works separately — we denote the first set of growth data covering the directed graph as YouTube-D and the second set representing the undirected graph as YouTube-U. The YouTube-D data set represents the growth of a directed network over a period of 36 days. During that period of daily growth observations, we observed over 540,000 new links being formed and discovered over 130,000 new users. This represents, relative to the initial network snapshot, over 13% growth in the number of users and over 12% growth in the number of links. The YouTube-U data set represents the growth of an undirected network over a period of 165 days. We observed the network grow by over 11.7 million links and overPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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