Yahoo should have acquired Netflix or Hulu instead of blogging platform Tumblr, she told Tech Brew.
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In an interview with Tech Brew, Mayer reiterated that one of her regrets was hiring the wrong chief operating officer, Henrique De Castro, whom she fired after 15 months on the job.
A source at the time told Insider Mayer was "very personally engaged in this deal," working late into numerous evenings.
Mayer's biggest regret, however, was not making "the tax-free Alibaba spinoff to separate the assets of the company," she told Tech Brew.