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I've even gone in to Alexa to start verifying all of our back-links. All of our links are from blogs / news / twitter , et al. That said, it doesn't mean Penguin didn't hurt us. Algorithms have corner cases.

Use Open Site Explorer to start on your bad link search:


OpenSE and Majestic SEO databases are not really going to find the spammy links that penguin is targeting:


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