I can tell you that it is not just based on backlinks because I have a site that has 0 backlinks and was able to get a PR4 rating for it in less than 6 months. The site is darnriver.com, I'm currently selling it as I don't have the time to work on it anymore but you can run all the checks you want and see it's a PR4 with 0 backlinks. The only think i can think of how it got that is from the autoping part of the blog. Other than that, never promoted it at all and never linked to if from any of my other sites.
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