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A new disclosure from Yahoo — now known as Oath after it was bought by telecom company Verizon — dramatically escalates the size of the 2013 hack revealed last year. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

Yahoo CEO Marissa Mayer, seen in 2014, wrote a farewell post to employees titled "Nostalgia, Gratitude & Optimism." She signed off with: "Yaho-o-oo! Marissa." Julie Jacobson/AP hide caption

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Julie Jacobson/AP