SEO is a topic with many unknown variables. Google doesn’t divulge how their search engine works and many try to solve the mystery. Because of that alone there are a lot of theories that are often unproved. The way to check those ideas is to perform a series of experiments like Commission Blueprint did with their PR to content link test. They have tested 100s of sites over a period of a year. This kind of test is statistically significant and proves the idea. In this case, by the way, the link of PR and content was proven to be non-existent.
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