Ok it is time to update this page, Google has finally released a penguin refresh after a very long wait of more than a year. It is time to check your rankings in various datacenters to see how your current and future rankings are progressing.
Here is a list of approximate dates when the penguin update happened.
1st Penguin update – April 12 2012
2nd Update – October 5, 2012
3rd Update – May 22, 2013
4th Update – October 4, 2013
5th Update October 18, 2014
More to the list : Based on unconfirmed reports about the penguin update:
Penguin 3.1 on November 27, 2014 (confirmed by Google, no impact given, Google considers part of Penguin 3.0)
Penguin 3.2 on December 2, 2014 (not confirmed by Google but based on publisher reports)
Penguin 3.3 on December 5, 2014
Penguin 3.4 on December 6, 2014
Please review our page on the latest penguin update and time line.