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 Panda
 Penguin
 Hummingbird
 Pigeon
 Mobile
 Rank Brain
 Possum
 Fred
 February 24, 2011
 Duplicate
 plagiarized or thin content
 user-generated spam;
 keyword stuffing
 April 24, 2012
 Spammy or irrelevant links
 links with over-optimized
anchor text
 August 22, 2013
 Keyword stuffing
 low-quality content
 July 24, 2014 (US);
 December 22, 2014
(UK, Canada, Australia)
 Poor on- and off-page SEO
 April 21, 2015
 Lack of a mobile
version of the page
 poor mobile usability
 October 26, 2015
 Lack of query-specific
relevance features
shallow content;
 poor UX
 September 1, 2016
 Tense competition in
your target location
 March 8, 2017
 Thin,
 affiliate-heavy
or
ad-centered content

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Google algorithm

  • 1.
  • 2.  Panda  Penguin  Hummingbird  Pigeon  Mobile  Rank Brain  Possum  Fred
  • 3.  February 24, 2011  Duplicate  plagiarized or thin content  user-generated spam;  keyword stuffing
  • 4.  April 24, 2012  Spammy or irrelevant links  links with over-optimized anchor text
  • 5.  August 22, 2013  Keyword stuffing  low-quality content
  • 6.  July 24, 2014 (US);  December 22, 2014 (UK, Canada, Australia)  Poor on- and off-page SEO
  • 7.  April 21, 2015  Lack of a mobile version of the page  poor mobile usability
  • 8.  October 26, 2015  Lack of query-specific relevance features shallow content;  poor UX
  • 9.  September 1, 2016  Tense competition in your target location
  • 10.  March 8, 2017  Thin,  affiliate-heavy or ad-centered content