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| 2013 || March || Growth || Tumblr passes the 100 million blogs milestone,<ref>{{cite web |last1=MacMillan |first1=Gordon |title=Yahoo agrees to pay in excess of $1bn for Tumblr |url=https://www.campaignlive.com/article/yahoo-agrees-pay-excess-1bn-tumblr/1182845 |website=campaignlive.com |accessdate=22 November 2019}}</ref> with 117 million unique users worldwide, up from about 58 million a year earlier.<ref>{{cite web |last1=Young |first1=Noel |title=Marissa brings Tumblr into the Yahoo family for $1.1 billion |url=https://www.thedrum.com/news/2013/05/19/marissa-brings-tumblr-yahoo-family-11-billion |website=thedrum.com |accessdate=22 November 2019}}</ref><ref>{{cite web |title=It’s Been Confirmed: Yahoo Is Buying Tumblr |url=https://m2bespoke.co.uk/blog/it039s-been-confirmed-yahoo-is-buying-tumblr-2013052200/ |website=m2bespoke.co.uk |accessdate=22 November 2019}}</ref>
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| 2013 || April || || Tumblr launches mobile in-stream ads, its biggest advertising initiative to date. For the first time advertisers may access to Tumblr stream, where users see friends’ posts and their own. The advertisements look like regular posts and users would see no more than four ads a day.<ref>{{cite web |title=Inside Tumblr's Massive Monetization Opportunity |url=https://www.businessinsider.com.au/tumblr-massive-monetization-opportunity-2013-5 |website=businessinsider.com.au |accessdate=24 November 2019}}</ref>
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| 2013 || May || || "In may of 2013, tumblr was purchased by the Yahoo! ceo Marissa Mayer. At this time tumblr was receiving 100 million users a day with 90 million posts to follow. Mayer scored tumblr for $1.1 billion cash and her first words were “we promise not to screw it up.”"<ref name="a Breif History of tumblr"/> ". The site was acquired by Yahoo in 2013 and declined along with the rest of that corporate entity, and is now owned by Verizon’s Oath division. But in its prime, Tumblr was a hotbed for Weird Internet, generating unforgettable memes, crazy stories, and legendary posts. Here are some of the most notorious. Thanks to tumblr memedocumentation and Twitter user 3liza for research help."<ref name="8 Insane Moments on Tumblr That Will Go Down in History"/><ref name="a Breif History of tumblr"/>
