Commenting on blogs or forums is not an effective link-building effort. Most blogs will add the nofollow HTML tag which blocks the passage of trustrank. Google likely de-emphasizes comment links because non-moderated comments are not under the direct control of the website owner – they are created by the same people who are hoping to gain from their existence! Comment linking is essentially comment spamming. Steer clear of SEO companies offering comment links.
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SEO Tips 2
