If you manage them right, blog commenters HELP your blog instead of merely pumping your site with spam. How? Make them content partners--set up a threshold number of APPROVED comments before you DO FOLLOW their link...
Why? Create a win win situation--they win when they get a do follow highly targeted link (assuming they selected your blog for niche relevance). You win by getting more relevant original content that complements/enhances your existing content.
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