http://overlima.com/do-seo-meta-tags-work-or-has-relnofollow-killed-them
Using rel nofollow is a great way to control the passing of page rank between pages. But its also very good at increasing your ranking in the Google by preventing an infinity loop.
Back in 2005, or there abouts, Google introduced a new html tag to its arsenal of tools to try and combat spam. At that time there was a growing amount of blog comment spam and blog and ping tactics to bring link love from blog site to their own site.
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