Panda Version

Released Date

Brief summary

Panda 1.0

February 24, 2011

Affects 12% of U.S queries. Penalizes sites with Thin content, content farms and high ad-to-content ratio.

Panda 2.0

April 11, 2011

Rolled out internationally. Affects 2% of U.S queries worldwide.

Panda 2.1

May 10, 2011

No impact data released. Serene impact with meager tweak.

Panda 2.2

June 16, 2011

No impact data released. Focused to improve scraper detection.

Panda 2.3

July 23, 2011

Minor impact. It incorporated new signals that help differentiate between higher- and lower-quality sites

Panda 2.4

August 12, 2011

Rolled out internationally for all languages except Chinese, Japanese, and Korean. Impacts 6-9% of queries.

Panda 2.5

September 28, 2011

Impact unknown. Some sites experienced fall in rankings while Google owned sites ranked higher.

Panda 2.5.1

October 9, 2011

Impact data unknown. Relatively minor updates.

Panda 2.5.2

October 13, 2011

Impact data unknown. Minor tweaks.

Panda 3.0

October 19, 2011

Unnoticed update. Anticipated to fix sites unfairly punished by original panda update.

Panda 3.1

November 18, 2011

Minor update. Impact less than 1% of all searches.

Panda 3.2

January 18, 2012

Minor update. A mere data refresh of the algorithm without any algorithmic changes.

Panda 3.3

February 27, 2012

A data refresh in the Panda system making it more accurate and sensitive. Impact unknown.

Panda 3.4

March 23, 2012

Impacts about 1.6% of queries. Targets low quality websites.

Panda 3.5

April 19, 2012

Impact data not available. Appears to have been fairly routine update with minimal impact.

Panda 3.6

April 27, 2012

Implications of this update were unclear and seemed to be relatively minor.

Panda 3.7

June 8, 2012

Affected 1% of all search queries worldwide and <1% in the U.S.

Panda 3.8

June 25, 2012

A data refresh, no new algorithm signals updated. Impact unknown.

Panda 3.9

July 24, 2012

This Panda refresh impacted ~1% of queries.

Panda 3.9.1

August 20, 2012

A minor Panda refresh affected less than 1% of search queries.

Panda 3.9.2

September 18, 2012

A mere refresh that impacted less than 0.7% of queries.

Panda #20

September 27, 2012

Major update. Affected 2.4% of English search queries and 0.5% of non-English queries.

Panda #21

November 5, 2012

Minor compared to Panda #20. Affected about 0.4% of the queries worldwide and 1.1 % in the United States.

Panda #22

November 21,2012

Affects 0.8 % of English queries. Seemed minor update as compared to Panda #20.

Penguin version

Released Date

Brief summary

Penguin

April 24, 2012

Webspam update later dubbed as Penguin. Impacts 3.1% of English Queries.

Penguin 1.1

May 25, 2012

First Penguin algorithm data refresh. Affected <0.1% of English searches.

Penguin #3

October 5, 2012

Minor Penguin data update, impacting 0.3% of Queries.