The Panda data refreshes continue to role out this month with the latest update coming on November 21st. This marks the second data refresh this month and the 22nd Panda refresh since its initial launch in February 24th of 2011. This refresh has been confirmed but not officially announced yet and projects to impact 0.8% of English queries.
Google has been making frequent updates to Panda with 2 updates in both November and September of this year. It is important to keep up with the changes to Panda as they could drastically impact your site. I wanted to take this time to provide a list of the panda updates since 2011.
Panda Update 1, Feb. 24, 2011 (11.8% of queries; announced; English in US only)
Panda Update 2, April 11, 2011 (2% of queries; announced; rolled out in English internationally)
Panda Update 3, May 10, 2011 (no change given; confirmed, not announced)
Panda Update 4, June 16, 2011 (no change given; confirmed, not announced)
Panda Update 5, July 23, 2011 (no change given; confirmed, not announced)
Panda Update 6, Aug. 12, 2011 (6-9% of queries in many non-English languages; announced)
Panda Update 7, Sept. 28, 2011 (no change given; confirmed, not announced)
Panda Update 8, Oct. 19, 2011 (about 2% of queries; belatedly confirmed)
Panda Update 9, Nov. 18, 2011: (less than 1% of queries; announced)
Panda Update 10, Jan. 18, 2012 (no change given; confirmed, not announced)
Panda Update 11, Feb. 27, 2012 (no change given; announced)
Panda Update 12, March 23, 2012 (about 1.6% of queries impacted; announced)
Panda Update 13, April 19, 2012 (no change given; belatedly revealed)
Panda Update 14, April 27, 2012: (no change given; confirmed; first update within days of another)
Panda Update 15, June 9, 2012: (1% of queries; belatedly announced)
Panda Update 16, June 25, 2012: (about 1% of queries; announced)
Panda Update 17, July 24, 2012:(about 1% of queries; announced)
Panda Update 18, Aug. 20, 2012: (about 1% of queries; belatedly announced)
Panda Update 19, Sept. 18, 2012: (less than 0.7% of queries; announced)
Panda Update 20 , Sep. 27, 2012 (2.4% English queries, impacted, belatedly announced
Panda Update 21, Nov. 5, 2012 (1.1% of English-language queries in US; 0.4% worldwide; confirmed, not announced)
Panda Update 22, Nov. 21, 2012 (0.8% of English queries were affected; 0.4% worldwide; confirmed, not announced)
By Matthew Wilkos