Rolled out 4 October 2013. Penguin 2.1 was a data refresh of the Penguin 2.0 link spam algorithm that Matt Cutts said noticeably affected about 1% of searches, followed by a year-long wait.
Rolled out 25 May 2012. Penguin 1.1 was the first Penguin data refresh, affecting under 0.1% of English searches and proving that cleaned-up sites could recover on the next run.
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