Google Algorithm Updates of 2009

NoDateUpdateNoticeable effectReferences
1February 2009Rel-canonical TagUnknownSEO Moz, Matt Cutts
2February 20, 2009Vince ChangesUnknownSearch Engine Land, Webmaster World, Matt Cutts
3August 10, 2009Caffeine(Preview)UnknownGoogle Webmaster Central Blog, Search Engine Land, Mashable
4December 2009Real-time SearchUnknownSearch Engine Land
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