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| 1991 || || || "It is believed that SEO was born in 1991. Around this time, the world’s first website was launched, and one quickly turned into many as websites crowded the internet. So, there was a huge need for structure and accessibility, and the world’s first search engines were created. "<ref name="bluefrogdm.coms">{{cite web |title=A BRIEF HISTORY OF SEO |url=https://www.bluefrogdm.com/blog/a-brief-history-of-seo |website=bluefrogdm.com |accessdate=7 January 2020}}</ref>
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| 1992 1991 || || || "Gopher system is released by Mark P. McCahill, Farhad Anklesaria, Paul Lindner, in 1992Daniel Torrey, and Bob Alberti of the {{w|University of Minnesota}}<ref name="wwwunleashed">{{cite book|last=December|last2=Randall|first=John|first2=Neil|page=[https://archive.org/details/worldwidewebunle00dece/page/20 20]|title=The World Wide Web unleashed|year=1994|publisher=Sams Publishing|isbn=1-57521-040-1|url-access=registration|url=https://archive.org/details/worldwidewebunle00dece/page/20}}</ref> Gopher became is considered to be the first search engine using a hypertext paradigm. "<ref name="thehistoryofseo.com">{{cite web |title=The History of Search Engine Optimization |url=http://www.thehistoryofseo.com/The-Industry/The_History_of_Search_Engine_Optimization.aspx |website=thehistoryofseo.com |accessdate=6 January 2020}}</ref>
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| 1992 || || || "VLib"<ref name="tellmeyourgoal.coms"/>
