New Negative SEO Hurts Google Rankings… Without Using Backlinks

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"Bartosz Góralewicz recently posted a case study where two different sites seem to be impacted by negative SEO. But the big difference with these negative SEO attacks is they were done without the use of any backlinks."

http://www.thesempost.com/new-negative-seo-hurts-google-rankings-without-using-backlinks/