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On Tuesday, Yahoo chief Marissa Mayer told investors that Tumblr would likely make more than $100 million in 2015. In our series this week, we learned that the social platform's millennial-leaning user base has grown 33 percent since Mayer and her team purchased it for $1.1 billion. And we examined how mobile advertising will be key if the company is to hit predictions like the one she set yesterday.
"More than 260 of the world's top brands have a Tumblr presence," Mayer said.

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