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| 2008 || December 11 || Financial || 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 || Product || Tumblr releases its first app “tumblrette” with which app users have the freedom to post to their blog whenever they want. This was is the start of tumblr becoming very popular.<ref name="a Breif History of tumblr"/>
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| 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"/>