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[edited by: tedster at 5:54 pm (utc) on Feb 7, 2011]
[edit reason] point video link to the original source [/edit]
However, Matt also states that while in the past social site links were not used as signals for ranking by Google, they are used today. Furthermore, to evaluate the quality of such links, Google also evaluates the personal reputation of the authors on those social media sites. This process is still in its very early stages and is continually being appraised for effectiveness and so on.