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| 2007 || || || Marcel Molina receives a message from Karp that he is publishing his first "Tumblr" tumbleblog, inspired by Projectionist. Karp format is presented as a new and advanced 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> The consulting arm of Davidville is shut down, and the company is renamed Tumblr, Inc. Karp sells 25% of his company for US$750,000 to a small group of investors.<ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr"/>
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| 2007 || October || || Karp shuts down his consultancy business as his work with Tumblr demands more time.<ref>{{cite AV media |last1 = Karp |first1 = David |date = September 27, 2011 |title = David Karp, Founder and CEO, Tumblr - #MyStartupStory |type = Video |url = https://www.youtube.com/watch?v=-bgu-yT4YeE |accessdate = February 24, 2013 |time = 1:40 |publisher = {{w|Hiscox}} |quote = It took about six months before I just gave in and said 'Alright, I'm pissing off my clients, we're not returning their calls, Tumblr seems to be where our hearts are, let's go for it.' }}</ref>
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| 2007 || October 31 || || Karp sells 25% of his company to a small group of investors and Tumblr receives US$750,000 of early stage venture.<ref>{{cite web |title=Series A - Tumblr Inc. |url=https://www.crunchbase.com/funding_round/tumblr-series-a--1a15d93c#section-overview |website=crunchbase.com |accessdate=25 November 2019}}</ref><ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr"/>
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| 2007 || November 1 || Service launch || Tumblr website is fully launched.<ref name="A History of Tumblrd"/>
| 2008 || || || John Maloney, Karp's former boss at UrbanBaby, is hired as the president of Tumblr.<ref name="David Karp: The Mastermind"/>
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| 2008 || Late year December 11 || || Karp sells 25% of Tumblr as part of a US$4.5m funding round from Union Square Ventures and Spark Capital.<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><ref>{{cite web |title=Series B - Tumblr Inc. |url=https://www.crunchbase.com/funding_round/tumblr-series-b--5887dafc#section-overview |website=crunchbase.com |accessdate=25 November 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"/>
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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>
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| 2010 || April 20 || || Tumblr receives US$5 million late stage venture funding.<ref>{{cite web |title=Series B - Tumblr Inc. |url=https://www.crunchbase.com/funding_round/tumblr-series-b--5887dafc#section-overview |website=crunchbase.com |accessdate=25 November 2019}}</ref>
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| 2010 || August || Growth || Tumblr surpasses 1 billion posts.<ref name="sfgh">{{cite web |title=Tumblr: A New Friend to Fashion |url=https://www.thebrandshow.tv/it/news/5696-tumblr:-a-new-friend-to-fashion-tribaspace |website=thebrandshow.tv |accessdate=24 November 2019}}</ref>