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...all the sites have nofollow on their links!
It's a fraction of a percent that use it on links.I see that statement occasionally, but nobody ever provides a reference. It's possible that it might have been true 10 years ago, but there's no way anyone will convince me that it's true now. The vast majority of links from forums and blog comments are nofollow. Not to mention sites like facebook, amazon, wikipedia, and many others put nofollow tags on all external links. My estimate would be that at least 80% of all new external links are nofollow.