Penguin 2.1 or Penguin 5 Is Now Live on October 4, 2013

Penguin 2.1 (aka Penguin 5) rolled out late Friday night, October 4, 2013. This is the fifth Penguin algorithm update and continues to target web spam that violates Google’s Quality Guidelines, as confirmed and reminded by Matt Cutts tweet.

Know more on http://googlewebmastercentral.blogspot.in/2012/04/another-step-to-reward-high-quality.html