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This week at the SMX Advanced conference in Seattle, Cutts joined the discussion around nofollow during the duplicate content session. According to Outspoken Media's Lisa Barone: A debate broke out mid-session when Matt Cutts got involved about whether or not nofollow is still effective. Of course, as soon as it got hot, all search representatives got very tight lipped about who said what and what they really meant. As far as I could, Matt Cutts did NOT say that they ignore nofollow, but he DID hint that it is less effective today than it used to be. Later, Cutts addressed the issue again in his You&A keynote. When asked about PageRank sculpting, Cutts said that it will still work, but not as well. Basically, using nofollow will still prevent PageRank from passing from the linking page through the nofollowed link. But that PageRank is no longer "saved" to be used by other links on the page. It just "evaporates," according to Cutts. Rand Fishkin at SEOmoz has some visual aids to help describe the process. This change mainly affects those SEOs that have tried to optimize their pages using the nofollow tag for PageRank sculpting. It's safe to say that most site owners have no idea what PageRank sculpting is, which is probable a good thing, since it can quite easily be done wrong and cause more problems than it solves.