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| 2011 || September 26 || || Tumblr raises $85 million from Greylock Partners and Insight Venture Partners, and reaches an US$800 million valuation.<ref>{{cite web |title=Tumblr Raises $85 Million From Greylock Partners And Insight Venture Partners |url=https://www.businessinsider.com/tumblr-raises-85-million-from-greylock-parters-and-ivp-2011-9 |website=businessinsider.com |accessdate=25 November 2019}}</ref>
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| 2011 || October 7 || || Tumblr is ranked N°22 on {{w|Business Insider}} list of the 100 most valuable startups at an US$800 million valuation.<ref>{{cite web |title=The 100 Most Valuable Startups In The World, Revamped And Revised! |url=https://www.businessinsider.com/2011-digital-100 |website=businessinsider.com |accessdate=25 November 2019}}</ref>
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| 2011 || October || || Tumblr becomes the first blogging platform to host United States President {{w|Barack Obama}}'s blog.<ref>{{cite web |title=Airbnb and Dropbox among companies tipped to IPO |url=https://www.smartcompany.com.au/startupsmart/advice/startupsmart-growth/airbnb-and-dropbox-among-companies-tipped-to-ipo/ |website=smartcompany.com.au |accessdate=25 November 2019}}</ref>
