Penguin 5, With The Penguin 2.1 Spam-Filtering Algorithm, Is Now Live

The fifth confirmed release of Google’s “Penguin” spam fighting algorithm is live. That makes it Penguin 5 by our count. But since this Penguin update is using a slightly improved version of Google’s “Penguin 2″ second-generation technology, Google itself is calling it “Penguin 2.1.” Don’t worry. We’ll explain the numbering nonsense below, as well as what this all means for publishers.

Source:http://searchengineland.com/penguin-2-1-and-5-live-173632