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I know this is like beating a dead horse, but thought I would link to Search Metric's 2014 ranking factors study. What is missing in what they see as factors that increase rank is ALT tags on images. You can see the infographic below, you can also download the 80+ page report which I would highly recommend http://www.searchmetrics.com/wp-content/uploads/infographic-seo-ranking-factors-2014.jpg ~Cheers