When our rankings dropped dramatically, it was the supplemental index that lead us to find the answer why. We simply updated our (5 year old) code with do not follow and do not index tags to let Google know we were not spamming them or the user with useless information (it was photo galleries and former versions of updated pages that were supplemental). This was a valuable tool for us to make sure our code stays in compliance with Google. It will be a shame if they take it away from honest webmasters, just trying to keep content and code as up to date as possible.

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