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| 2005 || May–December || {{w|SEO contest}} || "Hommingberger Gepardenforelle 2005. Another German contest, the goal of this SEO contest was to figure out how search engines determined rankings. Sponsored by Computer Magazine, the contest was run from May 15 - December 15th, 2005."<ref name="Previous SEO Competitions"/>
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| 2005 || June || || " Then, in June, Google debuted debuts personalized search, which used someone’s makes use of user personal search and browsing history to make results more relevant."<ref name="A Brief History of Search & SEO"/>
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| 2005 || || || "Also in 2005, nofollow tags were created as a means to combat spam. SEO pros began using this tag as a way of PageRank sculpting."<ref name="20 Years of SEO: A Brief History of Search Engine Optimization"/>
