Basically, link juices (PR percentage) are passed on when the link has no rel="nofollow" directive on it. Dofollow is the absence of rel="nofollow" in the linking code. ex. <a href="link">. So, a dofollow backlink really is a factor in increasing site's PR. Additionally, it's highly observed by SEOs that the higher the PR of the page where you get your link from, the more link juice it can pass on, the faster you'd notice an increase on your site's PR.



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