First release in Feb 2011, impacted globally in Apr 2011.
Aim to lower ranking of low quality sites.
Effect could range from a specific page(s) to the entire site.
Best policy to prevent being penalized is keep content duplication as little as possible.
1. Panda 1.0 (aka the Farmer Update) on February 24th 2011
2. Panda 2.0 on April 11th 2011. (Panda impacts all English speaking countries)
3. Panda 2.1 on May 9th 2011 or so
4. Panda 2.2 on June 18th 2011 or so.
5. Panda 2.3 on around July 22nd 2011.
6. Panda 2.4 in August 2011(Panda goes international)
7. Panda 2.5 on September 28th 2011
8. Panda 2.5.1 on October 9th 2011
9. Panda 2.5.2 on October 13th 2011
10. Panda 2.5.3 on October 19/20th 2011
11. Panda 3.1 on November 18th 2011
12. Panda 3.2 on about January 15th 2012
13. Panda 3.3 on about February 26th 2012
14. Panda 3.4 on March 23rd 2012
15. Panda 3.5 on April 19th 2012
16. Panda 3.6 on April 27th 2012
17. Panda 3.7 on June 8th 2012
18. Panda 3.8 on June 25th 2012
19. Panda 3.9 on July 24th 2012
20. Panda 3.9.1 on August 20th 2012
21. Panda 3.9.2 on September 18th 2012
22. Panda Update #20 on September 27 2012 (overlapped the EMD Update)
23. Panda #21 on November 5th 2012
24. Panda #22 on December 4th 2012
25. Panda #23 on December 21st 2012
26. Panda #24 on Jan. 22nd 2013
27. Panda #25 on March 25th 2013 (confirmed as coming; not confirmed as having happened)
28. Panda 4.0 on May 20 2014
29. Panda 4.1 on September 5 2014
30 Panda 4.2 on mid July 2015, due to the slow rollout of this update
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