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Google has confirmed that they ran a refresh to the Google Panda algorithm on Wednesday, November 21st.

On November 20th, we asked Google about a Panda refresh – since we were fairly confidentthere was some sort of update. Google told us there was no update but an update would be coming within 7 to 10 days. The update came a day later, not several days later.

This would make this the 22ndPanda refresh we’ve tracked. The 21st Panda refresh was on November 5th and impacted about 1.1% of English queries. This update, Google told us 0.8% of English queries were affected to a degree that aregular user might notice.

Here are all the releases so far for Panda:

Panda Update 1, Feb. 24, 2011 (11.8% of queries; announced; English in US only)
Panda Update 2, April 11, 2011 (2% ofqueries; 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, notannounced)
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)
PandaUpdate 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....