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didnt know this, but it makes sense
When blogging became popular, SEO savvy folk jumped at the opportunity to use and abuse the comments features of blogs. The original PageRank algorithm, devised in 1997, didn't take into account user generated content and by 2005 blogs had become a major target for spam. The nofollow attribute was introduced as a standard feature of Blogger and WordPress. This took most of the SEO value out of links posted in user comments of blogs.
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