Tough times these days for all webmasters and editors around the world. Google just updated its algorithm with a Panda 3.7 Update on June 8. Sure this is the beginning of Summer and Vacation and trafic can be impacted with a -20 to -30% loss but you also have to take in account the regular Google updates.
History of Panda Updates
Panda 3.7 on June 8th
Panda 3.6 on April 27th
Panda 3.5 on April 19th
Panda 3.4 on March 23rd
Panda 3.3 on about February 26th
Panda 3.2 on about January 15th
Panda 3.1 on November 18th
Panda 2.5.3 on October 19/20th
Panda 2.5.2 on October 13th
Panda 2.5.1 on October 9th
Panda 2.5 on September 28th
Panda 2.4 in August
Panda 2.3 on around July 22nd.
Panda 2.2 on June 18th or so.
Panda 2.1 on May 9th or so.
Panda 2.0 on April 11th or so.
Panda 1.0 on February 24th
History of Penguin Updates
Penguin 1.1. Update on May 25th 2012
Penguin 1.0 on April 24th 2012
See also Google Algorithm Change History on SEO Moz.
Google Partially Removes Penalties
According to seroundtable, Google “will partially remove a penalty when they see you take significant action on a notification“. These are good news because this can be difficult to remove some bad backlinks :
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