Matt Cutts, Google's head of search spam, posted a 90-second video on what happens if a site that is selling links also links to your site.
In short, Matt Cutts explains that when sites that sell links (with Google knowing about it) link to you, Google won't pass value from that link seller website. So, if a site that sells links is linking to you, it most likely won't hurt you. Matt said that the link will not benefit you and most likely will not hurt you.
(1) Websites that sell links will see their toolbar PageRank downgraded by 30, 40 or 50%.
(2) The site wil [...]
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