The fifth confirmed release of Google’s “penguin” spam fighting algorithm is live. That makes it Penguin 5 by our calculation. But since this Penguin update is using a little enhanced 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.
For More Information: http://searchengineland.com/penguin-2-1-and-5-live-173632