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Google Penguin, the Second (Major) Coming: How to Prepare
"Unless you've had your head under a rock you've undoubtedly heard the rumblings of a coming Google Penguin update of significant proportions.
To paraphrase Google’s web spam lead Matt Cutts the algorithm filter has "iterated" to date but there will be a "next generation" coming that will have a major impact on SERPs.
Having watched the initial rollout take many by surprise it make sense this time to at least attempt to prepare for what may be lurking around the corner."