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05/10/2013 11:09
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
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.
New Version Of Penguin Live Today
The head of Google’s web spam team, Matt Cutts, shared the news on Twitter, saying the latest release would impact about 1 percent of all searches:
The link that Cutts points at, by the way, explains what Penguin was when it was first launched. It doesn’t cover anything new or changed with the latest release.
Previous Updates
Here are all the confirmed releases of Penguin to date:
- Penguin 1 on April 24, 2012 (impacting around 3.1% of queries)
- Penguin 2 on May 26, 2012 (impacting less than 0.1%)
- Penguin 3 on October 5, 2012 (impacting around 0.3% of queries)
- Penguin 4 (AKA Penguin 2.0) on May 22, 2013 (impacting 2.3% of queries)
- Penguin 5 (AKA Penguin 2.1) on Oct. 4, 2013 (impacting around 1% of queries)
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