Quote:
Originally Posted by Profits of Doom
For both mainstream and adult blogs I have always been able to build up a fair amount of backlinks and traffic by commenting on other blogs. If you go through a blog's older posts you are often able to find comment pages that have decent PR, so you end up with a decent one way backlink...
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But you don't as blog comments are automatically set with a Nofollow attribute. On top of this you are actually harming your SEO as Google openly admits to penalising those that do such a thing:
Official Google Blog: Preventing comment spam
Most weblog software now marks reader-submitted links this way by default (with no option to disable it without code modification).
Source -
Spam in blogs - Wikipedia, the free encyclopedia