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"There are several helpful SEO breakdown infographics that explain how to optimize web pages, but this one brought to you by Search Metrics narrows the focus down to the most vital search ranking factors in order of importance. By analyzing 300,000 top-ranking URLs, certain commonalities stood out regarding Google optimization factors. Even without the proper on-page optimization, sites can still achieve top search result positions by having many social signals such as Facebook and Google+, as well as plenty of backlinks. Technical aspects and content quality play important roles in search ranking with site speed being an essential requirement. Each of these search ranking factors further delved into and broken down into elements that can make or break a site."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.trendhunter.com/trends/search-ranking-factors>