Google’s spam chief, Matt Cutts faced a question from one of the webmasters where it was asked that whether Google uses different algorithms for ranking webpages at different positions? These can be signals like freshness, backlinks or social popularity. Matt Cutts clearly answered this question with a straight NO. Google uses only a single algorithm in order to sort the hundreds or probably thousands of search results as per the “relevancy” and “reputability”.
Have a look at this video:
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