as a comcast customer, I can create a personal webpage. If I link this personal webpage to my other website, do I get a good ranking (since comcast.net has PR7) or it does not matter?
(my personal webpage at comcast does not have much traffic).
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This depends on the ranking of the page you are linking to. The page that is linking must have a higher pagerank than yours and should be at least a minimum of a PR2 or above.