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Why the Search Marketing Industry Must Adapt or Perish – Mashable

In December of 2010, both Google and Bing confirmed that links shared through Facebook or Twitter have a direct effect on search engine rankings. And in a 2011 Marketing Sherpa Report, 64% of marketers have begun integrating social media into their search marketing efforts. http://mashable.com/2011/03/04/search-marketing-changes/