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Marissa MayerMayer led Yahoo's $1.1 billion Tumblr acquisition that was later written down by over $700 million

In May 2013, Mayer championed Yahoo's $1.1 billion acquisition of Tumblr, promising advertisers would 'not screw it up.' However, by 2016 Yahoo wrote down Tumblr's value by $712 million, and Verizon eventually sold it for less than $3 million.