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* What are some of the several competitions specialized in SEO?
** Sort the full timeline by "Event type" and look for the group of rows with value "{{w|SEO contest}}".
** You will see a number of notable contests launched in English throughout the years. * What are some of the numerous books focused on SEO?** Sort the full timeline by "Event type" and other languageslook for the group of rows with value "Literature".** You will see a mostly random list of titles illustrating the literature industry on the topic of CEO.
* What are some events providing context to SEO?
** Sort the full timeline by "Event type" and look for the group of rows with value "Background".
| 2005 || June || {{w|Google}} || Notable update || Google debuts personalized search, which 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 || || || Product launch {{w|Spamdexing}} || {{w|Nofollow tag}}s are created as a means to combat spam. SEO professionals begin using this tag as a way of {{w|PageRanksculpting}} sculpting, a technique consisting in distributing the {{w|PageRank}} of a website to other subpages.<ref name="20 Years of SEO: A Brief History of Search Engine Optimization"/>
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| 2005 || August || || {{w|Spamdexing}} || The term ''[[w:Spam blog|splog]]'' (short for spam blog) is popularized around the time, when it is used publicly by {{w|Mark Cuban}}, who writes: " A splog is any blog whose creator doesn’t add any written value. I’m sure some might argue that packaging data, such as news feeds or the blog posts of others is added value. I dont think it is."<ref>{{cite web |title=A splog here, a splog there, pretty soon it ads up… and we all lose |url=https://blogmaverick.com/2005/08/15/a-splog-here-a-splog-there-pretty-soon-it-ads-up-and-we/ |website=blogmaverick.com |accessdate=27 June 2020}}</ref>
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| 2006 || May 11 || || SEO tool launch || {{w|Google Trends}} launches.<ref>{{cite journal |last1=Jun |first1=Seung-Pyo |last2=Yoo |first2=Hyoung Sun |last3=Choi |first3=San |title=Ten years of research change using Google Trends: From the perspective of big data utilizations and applications |doi=10.1016/j.techfore.2017.11.009 |url=https://www.sciencedirect.com/science/article/pii/S0040162517315536#:~:text=Google%20Trends%20was%20first%20introduced%20on%20May%2011%2C%202006.&text=Google%20Trends%20merely%20provides%20the,2016%20(Sullivan%2C%202016).}}</ref> It is a tool for SEO research.<ref>{{cite web |title=7 Ways to Use Google Trends for SEO & Content Marketing |url=https://www.searchenginejournal.com/google-trends/266721/ |website=searchenginejournal.com |accessdate=28 June 2020}}</ref>
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| 2006 || July 11 || || Literature || ''The Long Tail: Why the Future of Business Is Selling Less of More'' is published by Chris Anderson.<ref>{{cite web |title=The Long Tail: Why the Future of Business is Selling Less of More by Anderson, Chris (July 11, 2006) Hardcover Unknown Binding – January 1, 1800 |url=https://www.amazon.com/Long-Tail-Business-Anderson-Hardcover/dp/B014I8UA36 |website=amazon.com |accessdate=30 June 2020}}</ref>
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| 2006 || || {{w|Google}} || Product launch || Google launches Google Webmaster Tools, a suite of SEO tools that provides data and configuration control and lets webmasters view crawling errors, see what searches the user's site showed up for, and request reinclusion.<ref name="20 Years of SEO: A Brief History of Search Engine Optimization"/>
| 2007 || August || || SEO tool launch || SimilarWeb is founded.<ref>{{cite web |title=We are the measure of the digital world |url=https://www.similarweb.com/corp/about/ |website=similarweb.com |accessdate=28 June 2020}}</ref> It gives users the ability to see their competitors' traffic sources.<ref>{{cite web |title=SimilarWeb |url=https://backlinko.com/hub/content/similarweb#:~:text=Even%20though%20SimilarWeb%20isn't,sense%20for%20their%20respective%20sizes. |website=backlinko.com |accessdate=28 June 2020}}</ref>
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| 2007 || September || || {{w|Spamdexing}} || Concept development || Ralph Tegtmeier and Ed Purkiss coin the term "mosaic cloaking", which consists in only cloaking parts of the website in an effort to be more stealth.<ref>{{cite web |title=What is cloaking in SEO? How to apply cloaking on my affiliate links(Black Hat SEO technique) |url=https://www.linkedin.com/pulse/what-cloaking-seo-how-apply-my-affiliate-linksblack-hat-raman-sharma/ |website=linkedin.com |accessdate=27 June 2020}}</ref>
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| 2008 || February–April || || {{w|SEO contest}} || seocontest2008 launches. It is sponsored by the UK Webmaster World Community.<ref name="Previous SEO Competitions"/>
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| 2008 || March 31 || || Literature || ''Search Engine Optimization'' is published by Kristopher B. Jones.<ref>{{cite web |title=Search Engine Optimization: Your visual blueprint for effective Internet marketing |url=https://books.google.com.ar/books/about/Search_Engine_Optimization.html?id=Z91tXQIgxc8C&source=kp_book_description&redir_esc=y |website=books.google.com.ar |accessdate=30 June 2020}}</ref>
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| 2008 || June–August || || {{w|SEO contest}} || Busby SEO Challenge 2008 is held. It is sponsored by Busby Web Solutions based in {{w|Australia}}.<ref name="Previous SEO Competitions"/><ref>{{cite web |title=Busby SEO Challenge World Cup |url=http://ryangaraygay.com/busby-seo-challenge-world-cup/ |website=ryangaraygay.com |accessdate=27 April 2020}}</ref><ref>{{cite web |title=Busby SEO Challenge Contest 2008 |url=http://www.3seo.com/Busby-SEO-Challenge/ |website=3seo.com |accessdate=27 April 2020}}</ref>
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| 2009 || March–August || || {{w|SEO contest}} || Net Builders SEO Contest is held. The targeted keyword is "sulumits retsambew" which is webmaster stimulus backwards. Backwards seems to be a common trend in these contests.<ref name="Previous SEO Competitions"/>
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| 2009 || April || || Literature || ''Search Engine Optimization All-in-One for Dummies'' is published by Bruce Clay and Susan Esparza.<ref>{{cite web |title=Search Engine Optimization All-in-One For Dummies |url=https://books.google.com.ar/books/about/Search_Engine_Optimization_All_in_One_Fo.html?id=JYWBA4FoR7oC&source=kp_book_description&redir_esc=y |website=books.google.com.ar |accessdate=30 June 2020}}</ref>
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| 2009 || June 3 || [[w:Bing (search engine)|Bing]] || SEO tool launch || {{w|Bing Webmaster Tools}} launches along with [[w:Bing (search engine)|Bing]].<ref>{{cite web |title=Bing Webmaster Tools vs Google Search Console |url=https://www.fourfront.us/blog/google-search-console-vs-bing-webmaster-tools/ |website=fourfront.us |accessdate=28 June 2020}}</ref>
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| 2009 || September–December || || {{w|SEO contest}} || OES Tsetnoc SEO Contest is held.<ref name="Previous SEO Competitions"/>
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| 2009 || October || || Literature || ''The Art of SEO'' is published by Eric Enge, Stephan Spencer, Rand Fishkin, and Jessie Stricchiola.<ref>{{cite web |title=The Art of SEO: Mastering Search Engine Optimization |url=https://books.google.com.ar/books/about/The_Art_of_SEO.html?id=l334y5226sEC&source=kp_book_description&redir_esc=y |website=books.google.com.ar |accessdate=30 June 2020}}</ref>
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| 2009 || Year round || {{w|Google}} || Notable update || {{w|Google}} executes between 350 and 550 adjustments to its search algorithm along the year, meaning at least once a day, showing the "rapid advancement required to stay on top if playing the game of SEO at the highest level".<ref name="A brief history of Search Engine Optimization (SEO)"/>
| 2010 || || || {{w|Spamdexing}} || A tactic appears where websites are created from large amounts of low-quality textual content, frequently updated and specifically designed to lure search engine algorithms. These sites are linked together forming so-called ‘{{w|content farm}}s’ whose only purpose is to drive search engine traffic and, just like {{w|doorway page}}s before them, sending the incoming traffic to the final destination.<ref name="A brief history of Search Engine Optimization (SEO)"/>
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| 2010 || || || SEO tool launch || SEOPanel is released. It is an open source multi-website SEO monitoring application.<ref>{{cite web |title=Seo Panel |url=https://installatron.com/seopanel |website=installatron.com |accessdate=28 June 2020}}</ref>
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| 2010 || December || {{w|Google}} || Notable update || Both {{w|Google}} and {{w|Bing}} add "social signals," which first display any written Facebook posts, for example, from the user's own network that matches his/her query.<ref name="A Brief History of Search & SEO"/>
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| 2011 || || || SEO tool launch || Ahrefs launches. It is a toolset for backlinks and SEO analysis.<ref>{{cite web |title=What is Ahrefs.com? |url=https://help.ahrefs.com/en/articles/78203-what-is-ahrefs-com |website=help.ahrefs.com |accessdate=28 June 2020}}</ref><ref>{{cite web |title=Ahrefs Review: More Than Just an SEO Backlink Analysis Tool |url=https://www.99signals.com/ahrefs-review/ |website=99signals.com |accessdate=28 June 2020}}</ref>
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| 2012 || February 28 || || Literature || ''Content Strategy for the Web'' is published by Kristina Halvorson and Melissa Rach.<ref>{{cite web |title=Content Strategy for the Web: Content Strategy Web _p2 |url=https://books.google.com.ar/books/about/Content_Strategy_for_the_Web.html?id=KIIQ3Fq9CM8C&source=kp_book_description&redir_esc=y |website=books.google.com.ar |accessdate=30 June 2020}}</ref>
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| 2012 || April 24 || {{w|Google}} || Notable update || {{w|Google Penguin}} launches as a Google algorithm update.<ref name="A Brief History of Search & SEO"/><ref name="tellmeyourgoal.coms"/> It is aimed at decreasing [[w:Search engine optimization|search engine rankings]] of websites that violate Google's Webmaster Guidelines.<ref>{{cite web|url=https://support.google.com/webmasters/answer/35769#3|title=Webmaster Guidelines - Webmaster Tools Help|publisher=Support.google.com|accessdate=10 April 2020}}</ref>
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| 2012 || || || SEO tool launch || Kerboo launches as LinkRisk. It offers link audits, SEO, {{w|content marketing}}, and {{w|link building}}.<ref>{{cite web |title=2012: The start of our journey. |url=https://kerboo.com/about-us/ |website=kerboo.com |accessdate=29 June 2020}}</ref><ref>{{cite web |title=Kerboo |url=https://www.linkedin.com/company/kerboo-limited/about/ |website=linkedin.com |accessdate=29 June 2020}}</ref>
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| 2013 || June 27 || || Literature || ''Google Semantic Search'' is published by David Amerland.<ref>{{cite web |title=Google Semantic Search: Search Engine Optimization (SEO) Techniques That Get Your Company More Traffic, Increase Brand Impact, and Amplify Your Online Presence |url=https://books.google.com.ar/books/about/Google_Semantic_Search.html?id=niCJxqdc-eoC&source=kp_book_description&redir_esc=y |website=books.google.com.ar |accessdate=30 June 2020}}</ref>
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| 2013 || August || {{w|Google}} || Notable update || {{w|Google Hummingbird}} launches as an update, helping to combat {{w|keyword stuffing}}.<ref>{{cite web |title=FAQ: All About The New Google “Hummingbird” Algorithm |url=https://searchengineland.com/google-hummingbird-172816 |website=searchengineland.com |accessdate=23 June 2020}}</ref>
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| 2013 || October || {{w|Google}} || System launch || Google App Indexing is launched for a limited set of publishers. It is a system that allows searchers to click on listings in Google's search results, taking them into apps on their [[w:Android (operating system)|Android]] and {{w|iOS}} smartphones and tablets.<ref name="A brief history of Search Engine Optimization (SEO)"/> <ref>{{cite web |title=Google: App Indexing |url=https://searchengineland.com/library/google/google-app-indexing |website=searchengineland.com |accessdate=7 January 2020}}</ref><ref>{{cite web |title=The Death of the Desktop: The Future For Mobile SEO |url=https://www.4mation.com.au/blog/death-desktop-future-mobile-seo/ |website=4mation.com.au |accessdate=28 April 2020}}</ref>
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| 2013 || November 28 || || Literature || ''SEO Made Easy: Everything You Need to Know about SEO and Nothing More'' is published by Evan Bailyn.<ref>{{cite web |title=SEO Made Easy: Everything You Need to Know About SEO and Nothing More |url=https://books.google.com.ar/books/about/SEO_Made_Easy.html?id=kOJWAgAAQBAJ&source=kp_book_description&redir_esc=y |website=books.google.com.ar |accessdate=30 June 2020}}</ref>
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| 2013 || || || SEO tool launch || Serpstat is founded.<ref>{{cite web |title=All-in-One SEO platform |url=https://serpstat.com/about/ |website=serpstat.com |accessdate=28 June 2020}}</ref> IT offers a tool for keyword research, PPC analysis and competitor research.<ref>{{cite web |title=Serpstat Review: The Ultimate SEO & PPC Tool for Bloggers |url=https://www.99signals.com/serpstat-review/#:~:text=Serpstat%20is%20an%20exceptional%20tool,SEO%20tools%20in%20the%20market. |website=99signals.com |accessdate=28 June 2020}}</ref>
| 2014 || September || {{w|Google}} || {{w|Spamdexing}} || {{w|Google}} targets private blog networks (also known as {{w|link farm}}s) with manual action ranking penalties.<ref>{{cite web |title=Google Targets Sites Using Private Blog Networks With Manual Action Ranking Penalties |url=https://searchengineland.com/google-targets-sites-using-private-blog-networks-manual-action-ranking-penalties-204000 |website=searchengineland.com |accessdate=23 June 2020}}</ref>
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| 2014 || October 5 || {{w|Google}} || Notable update || Google launches Penguin 3.0, a new algorithm update aimed to penalize those sites who use black hat {{w|link building}} tactics to build unnatural links to manipulate search engines. The update affects 0.3% English Language queries all over the world.<ref>{{cite web |title=Google Penguin Update 3 Released, Impacts 0.3% Of English-Language Queries |url=https://searchengineland.com/google-penguin-update-3-135527 |website=searchengineland.com |accessdate=24 June 2020}}</ref> Black hat link building tactics are methods used to direct people to a site by exploiting website loopholes, enabling a site to rank higher than it should through "organic" search means.<ref>{{cite web |title=black hat link building |url=https://searchcontentmanagement.techtarget.com/definition/black-hat-link-building#:~:text=Black%20hat%20link%20building%20tactics,system%20and%20boost%20search%20rankings. |website=searchcontentmanagement.techtarget.com |accessdate=30 June 2020}}</ref>
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| 2014 || November || {{w|Google}} || Notable update || {{w|Google}} adds a "mobile-friendly" label for search results that are optimized for such platforms, where text is readable without zooming or horizontal scrolling, and links are spaced well enough so that there’s a reduced chance of mis-tapping.<ref name="A Brief History of Search & SEO"/><ref>{{cite web |title=Helping users find mobile-friendly pages |url=https://webmasters.googleblog.com/2014/11/helping-users-find-mobile-friendly-pages.html |website=webmasters.googleblog.com |accessdate=6 January 2020}}</ref>
| 2015 || February || {{w|Google}} || Notable update || Google announces a change, with a mobile-friendly test that allows webmasters to view potential issues and make changes before the rollout.<ref name="A Brief History of Search & SEO"/>
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| 2015 || March 16 || {{w|Google}} || Notable update || Google introduces a new penalty algorithm to decrease the likelihood of {{w|doorway page}} penalty algorithm to decrease the likelihood of doorway pages s ranking in search results.<ref>{{cite web |title=An update on doorway pages |url=https://webmasters.googleblog.com/2015/03/an-update-on-doorway-pages.html |website=webmasters.googleblog.com |accessdate=27 June 2020}}</ref><ref>{{cite web |title=How Doorway Pages Hurt Your Site’s SEO |url=https://thecontentworks.uk/doorway-pages/ |website=thecontentworks.uk |accessdate=27 June 2020}}</ref> Doorway pages are low-quality pages, optimized to rank well for specific keywords that act as a door between users and content.<ref>{{cite web |title=Google’s shutting the door on doorway pages for SEO |url=https://www.brafton.com/news/seo-1/googles-shutting-door-doorway-pages-seo/ |website=brafton.com |accessdate=30 June 2020}}</ref>
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| 2015 || April 21 || {{w|Google}} || Notable update || Google introduces search engine algorithm update so-called ‘{{w|Mobilegeddon}}’, which makes website mobile friendliness a ranking signal in searches.<ref name="A brief history of Search Engine Optimization (SEO)"/><ref>{{cite web |title=Finding more mobile-friendly search results |url=https://webmasters.googleblog.com/2015/02/finding-more-mobile-friendly-search.html |website=webmasters.googleblog.com |accessdate=7 January 2020}}</ref>
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| 2016 || March–June || || {{w|SEO contest}} || Apex Forum SEO Contest is held.<ref name="Previous SEO Competitions"/>
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| 2016 || September 13 || || Literature || ''SEO for Growth: The Ultimate Guide for Marketers, Web Designers & Entrepreneurs'' is published by John Jantsch and Phil Singleton.<ref>{{cite web |title=SEO for Growth: The Ultimate Guide for Marketers, Web Designers & Entrepreneurs |url=https://www.goodreads.com/book/show/32054694-seo-for-growth |website=goodreads.com |accessdate=30 June 2020}}</ref>
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| 2016 || December 27 || || Literature || ''Digital Marketing For Dummies'' is published by Russ Henneberry and Ryan Deiss.<ref>{{cite web |title=Digital Marketing For Dummies |url=https://books.google.com.ar/books/about/Digital_Marketing_For_Dummies.html?id=cx7NDQAAQBAJ&source=kp_book_description&redir_esc=y |website=books.google.com.ar |accessdate=30 June 2020}}</ref>
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| 2017 || January || {{w|Google}} || Notable update || {{w|Google}} introduces an algorithmic change called the “Intrusive Interstitial Penalty” in order to “punish aggressive interstitials and pop-ups that might damage the mobile user experience.”<ref name="tellmeyourgoal.coms"/>
| 2018 || July || {{w|Google}} || Notable update || {{w|Google}} announces that from then on, page speed would be a ranking factor for mobile searches.<ref name="A brief history of Search Engine Optimization (SEO)"/><ref>{{cite web |title=Using page speed in mobile search ranking |url=https://webmasters.googleblog.com/2018/01/using-page-speed-in-mobile-search.html |website=webmasters.googleblog.com |accessdate=7 January 2020}}</ref>
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| 2019 || January 26 || || {{w|Spamdexing}} || {{w|XRumer}} is released is a piece of software made for spamming online forums and comment sections. "It is marketed as a program for search engine optimization and was created by BotmasterLabs." <ref>{{cite web |title=XRumer |url=http://www.botmasterlabs.net/xrumer/ |website=botmasterlabs.net |accessdate=29 June 2020}}</ref>
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| 2020 || || || Background || Comscore predicts that by this year, 50% all searches will be voice.<ref name="A brief history of Search Engine Optimization (SEO)"/><ref>{{cite web |title=Stat of the week – Voice Search |url=https://blog.zooma.se/en/blog/stat-of-the-week-voice-search |website=blog.zooma.se |accessdate=7 January 2020}}</ref>
