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| 2007 || November 1 || Service launch || Tumblr website is fully launched.<ref name="A History of Tumblrd"/>
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| 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 || || 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>
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| 2009 || || || Marcel Molina is hired as engineer at {{w|Twitter}}.<ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr"/>
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| 2009 || Acquisition || Acquisition || Tumblr acquires iPhone app Tumblrette.<ref name="David Karp: The Mastermind"/>
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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>
