Google: Panda Updates

For the record, here’s the list of confirmed Panda Updates, with some of the major changes called out with their AKA (also known as) names:

1. Panda Update 1, AKA Panda 1.0, Feb. 24, 2011 (11.8% of queries; announced; English in US only)
2. Panda Update 2, AKA Panda 2.0, April 11, 2011 (2% of queries; announced; rolled out in English internationally)
3. Panda Update 3, May 10, 2011 (no change given; confirmed, not announced)
4. Panda Update 4, June 16, 2011 (no change given; confirmed, not announced)
5. Panda Update 5, July 23, 2011 (no change given; confirmed, not announced)
6. Panda Update 6, Aug. 12, 2011 (6–9% of queries in many non-English languages; announced)
7. Panda Update 7, Sept. 28, 2011 (no change given; confirmed, not announced)
8. Panda Update 8 AKA Panda 3.0, Oct. 19, 2011 (about 2% of queries; belatedly confirmed)
9. Panda Update 9, Nov. 18, 2011: (less than 1% of queries; announced)
10. Panda Update 10, Jan. 18, 2012 (no change given; confirmed, not announced)
11. Panda Update 11, Feb. 27, 2012 (no change given; announced)
12. Panda Update 12, March 23, 2012 (about 1.6% of queries impacted; announced)
13. Panda Update 13, April 19, 2012 (no change given; belatedly revealed)
14. Panda Update 14, April 27, 2012: (no change given; confirmed; first update within days of another)
15. Panda Update 15, June 9, 2012: (1% of queries; belatedly announced)
16. Panda Update 16, June 25, 2012: (about 1% of queries; announced)
17. Panda Update 17, July 24, 2012:(about 1% of queries; announced)
18. Panda Update 18, Aug. 20, 2012: (about 1% of queries; belatedly announced)
19. Panda Update 19, Sept. 18, 2012: (less than 0.7% of queries; announced)
20. Panda Update 20 , Sept. 27, 2012 (2.4% English queries, impacted, belatedly announced
21. Panda Update 21, Nov. 5, 2012 (1.1% of English-language queries in US; 0.4% worldwide; confirmed, not announced)
22. Panda Update 22, Nov. 21, 2012 (0.8% of English queries were affected; confirmed, not announced)
23. Panda Update 23, Dec. 21, 2012 (1.3% of English queries were affected; confirmed, announced)
24. Panda Update 24, Jan. 22, 2013 (1.2% of English queries were affected; confirmed, announced)
25. Panda Update 25, March 15, 2013 (confirmed as coming; not confirmed as having happened)
26. Panda Update 26, July 18, 2013 (confirmed, announced)
27. Panda Update 27 AKA Panda 4.0, May 20, 2014 (7.5% of English queries were affected; confirmed, announced)
28. Panda Update 28 AKA Panda 4.1, Sept. 25, 2014 (3–5% of queries were affected; confirmed, announced)
29. Panda Update 30 AKA Panda 4.2, July 18, 2015 (2–3% of queries were affected; confirmed, announced)

Source : http://searchengineland.com/google-panda-4-2-is-here-slowly-rolling-out-after-waiting-almost-10-months-225850

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