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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 || 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>
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| 2010 || November || || Tumblr adds US$25 million in funding to the preexisting investment pool of US$10 million.<ref name="sfgh"/>
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| 2011 || January || || Tumblr reaches more than 7 million individual blogs.<ref name="mashable.com">{{cite web |title=Tumblr Now Has More Blogs Than WordPress.com |url=https://mashable.com/2011/06/15/tumblr-surpasses-wordpress/ |website=mashable.com |accessdate=22 November 2019}}</ref>
