Today is a day no SEO and many webmasters will never forget, it is the day Google launched their Panda algorithm. On February 24, 2011, three years ago today, Google changed the SEO space forever by building an algorithm that would downgrade low-value content.

Panda had a larger impact on Google’s search results than most, if not all, search quality related algorithms in Google’s history. SEOs may argue that Penguin was felt more, and it likely was by SEOs, especially after Panda, but Panda probably had a wider imprint.

Since then, we had about 25 Panda refreshes and updates, here are some:

Panda #25 on March 15, 2013
Panda #24 on January 22, 2013
Panda #23 on December 21, 2012
Panda #22 on November 21st
Panda #22 on November 21st
Panda #21 on November 5th
Panda #20 on September 27th
Panda 3.9.2 on September 18th
Panda 3.9.1 on August 20th
Panda 3.9 on July 24th
Panda 3.8 on June 25th
Panda 3.7 on June 9th
Panda 3.6 on April 27th
Panda 3.5 on April 19th
Panda 3.4 on March 23rd
Panda 3.3 on about February 26th
Panda 3.2 on about January 15th
Panda 3.1 on November 18th
Panda 2.5.3 on October 19/20th
Panda 2.5.2 on October 13th
Panda 2.5.1 on October 9th
Panda 2.5 on September 28th
Panda 2.4 in August
Panda 2.3 on around July 22nd.
Panda 2.2 on June 18th or so.
Panda 2.1 on May 9th or so.
Panda 2.0 on April 11th or so.
Panda 1.0 on February 24th

Google stopped confirming Panda updates last year and then started doing rolling updates but that doesn’t mean they haven’t done work on fine tuning the algo. They softened it recently and there have been refreshes monthly, some larger than others but it is hard to know if it was Panda or something else.

Anyway, Panda is a significant update that is still felt today throughout our space.

Forum discussion at Google+.