Themes in Content: Hub And Authority Sites

It is almost universally agreed by search engine optimization (SEO) professionals that Google and probably the other search engines are using themeing to evaluate the relevance of incoming and outgoing links. Many also agree that themeing is used to measure the relevance of both on and off page content as part of the search algorithm. The question for most SEO experts is to what degree that themeing is indeed being employed by the search engines.
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