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| 2009 || Rise to popularity || Tumblr releases its first app “tumblrette” with which app users have the freedom to post to their blog whenever they want. This is considered the start of tumblr becoming very popular.<ref name="a Breif History of tumblr"/>
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| 2012 || || Tumblr signs its first big ad deal with {{w|Adidas}}. Now with big companies wanting to be featured tumblr was able to bring in more money. This proved the extent of the popularity of tumblr"<ref name="a Breif History of tumblr"/>
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| 2013–2017 || Acquisition || Tumblr is acquired by {{w|Yahoo}}. Since then, the site would decline along with the rest of that corporate entity.<ref name="8 Insane Moments on Tumblr That Will Go Down in History"/>
| 1986 || || Leadership || American {{w|web developer}} {{w|David Karp}} is born in {{w|New York City}}.<ref name="A History of Tumblrd">{{cite web |title=A History of Tumblr – See How David Karp Founded The Company |url=https://businessideaslab.com/tumblr-history/ |website=businessideaslab.com |accessdate=12 September 2019}}</ref>
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| 2005 || March || || "In March 2005, a 17-year-old German high school student named Chris Neukirchen invented this invents the tumblelog system, specifically for super-short blogging. He even used Neukirchen uses the term "''tumblin'" ' on his site [https://anarchaia.org/ Anarchaia: ]. The only rule for tumblelogs was is that they be a single paragraph — , a rule that persists on many Tumblr formats today." "Anarchaia was then would be followed by "Projectionist"," a blog project from two Americans, Marcel Molina and Sam Stephenson".<ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr">{{cite web |title=These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr |url=https://www.businessinsider.com/the-history-of-tumblr-2013-5 |website=businessinsider.com |accessdate=12 September 2019}}</ref>
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| 2006 || June || || "In June of 2006, the The development of tumblr began. tumblr was founded begins by young David Karp. tumblr became It would become public less than a year later."<ref name="a Breif History of tumblr">{{cite web |title=a Breif History of tumblr |url=https://www.timetoast.com/timelines/a-breif-history-of-tumblr |website=timetoast.com |accessdate=12 September 2019}}</ref>
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| 2007 || || || "In 2007, Marcel Molina received receives a message from Karp that he was is publishing his first "Tumblr" tumbleblog, inspired by Projectionist:" "It's important to point out that . Karp didn't "steal" Tumblr. His format was is presented as a new and advanced the short-form blogging format in several ways."<ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr"/>
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| 2007 || February 19 || Service launch || In his mother's small apartment located in {{w|Manhattan}}, David Karp launches Tumblr as a free, simplified microblogging service that facilitates the creation of {{w|tumblelog}}s (a sort of short-form blogs), useful for featuring links, short paragraphs and a stream of consciousness style. It becomes useful for users who want to setup quick and easy link blogs or photo blogs.<ref name="a Breif History of tumblr"/> The service is co-founded with Marco Arment.<ref name="Today in Media History">{{cite web |title=Today in Media History: David Karp and Marco Arment launched Tumblr in 2007 |url=https://www.poynter.org/reporting-editing/2015/today-in-media-history-david-karp-and-marco-arment-launched-tumblr-in-2007/ |website=poynter.org |accessdate=12 September 2019}}</ref><ref name="8 Insane Moments on Tumblr That Will Go Down in History">{{cite web |title=8 Insane Moments on Tumblr That Will Go Down in History |url=https://www.geek.com/culture/8-insane-moments-on-tumblr-that-will-go-down-in-history-1764378/ |website=geek.com |accessdate=13 September 2019}}</ref>
| 2007 || November 1 || Service launch || Tumblr website is fully launched.<ref name="A History of Tumblrd"/>
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| 2008 || Late year || || "Karp did sell sells 25% of his one-year-old company Tumblr as part of a US$4.5m funding round from Union Square Ventures and Spark Capital in late 2008."<ref name="theguardian.com">{{cite web |last1=Halliday |first1=Josh |title=David Karp, founder of Tumblr, on realising his dream |url=https://www.theguardian.com/media/2012/jan/29/tumblr-david-karp-interview |website=theguardian.com |accessdate=13 September 2019}}</ref>
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| 2009 || February || || Tumblr releases its first app “tumblrette” with which app users have the freedom to post to their blog whenever they want. This was the start of tumblr becoming very popular.<ref name="a Breif History of tumblr"/>
| 2009 || July || Growth || Tumblr receives over 50 million views a month. The site reports 6 posts every second and 2 reblogs for every second and a half. Every day tumblr receives 5,000 new users and they have 9 book deals.<ref name="a Breif History of tumblr"/>
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| 2009 || || || ". In 2009, Marcel Molina was is hired as engineer at {{w|Twitter's 20th engineer and continues to work there}}. "<ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr"/>
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| 2009 || || Leadership || Tumblr’s CEO David Karp is named the Best Young Tech Entrepreneur by {{w|Businessweek}}.<ref name="business2community.com">{{cite web |title=Tumblr: Finding Appeal in the Anti-Blog |url=https://www.business2community.com/blogging/tumblr-finding-appeal-in-the-anti-blog-0448300 |website=business2community.com |accessdate=22 November 2019}}</ref>
| 2012 || June || || Tumblr reports that {{w|pornography}} only accounts for 2-4% of all content on the site.<ref name="dwdw"/>
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| 2012 || June || || "tumblr had Tumblr signs its first big ad deal with adidas{{w|Adidas}}. Now with big companies wanting to be featured tumblr was able to bring in more money. This proved the extent of the popularity of tumblr"<ref name="a Breif History of tumblr"/>
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| 2012 || September || Growth || Tumblr reaches 73 million blogs.<ref name="dsss"/>
