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Yahoo! previously run a paid entry service that guaranteed crawling for an expense per click; nonetheless, this technique was discontinued in 2009. In 1998, two graduate students at Stanford College, Larry Web Page and Sergey Brin, created "Backrub", an internet search engine that rely upon a mathematical formula to rate the prestige of website. The number calculated by the algorithm, PageRank, is a feature of the quantity as well as strength of inbound web links. PageRank approximate…