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David Karp: Tumblr Wants to Empower Advertising Creativity

With 50 Million Users, a Big Platform for Brands

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If Tumblr is a platform for human creativity, Tumblr CEO David Karp says it can also be a platform for creative brands. At Ad Age Digital, Mr. Karp unveiled "Radar," an ad unit coming to the blog network in May. Here's a clip from his keynote:

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