In the past, Google have made contradictory statements regarding the role of social media in their ranking algorithm. On the one hand, they have stated that social media pages are indexed in the same manner as other web pages, and that social links therefore count as links.But on the other, they have stated that social metrics do not constitute direct ranking factors. Over at Microsoft, the guys behind Bing have said that they too consider the authority of social media profiles (e.g. Twitter profile metrics) and mentions across numerous social platforms in their search engine.
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