With reservations about the effectiveness of mobile advertising rapidly fading, U.S. spending on the platform more than doubled in the first half of the year, rising to $3 billion from $1.2 billion a year before, according to the Interactive Advertising Bureau. Total online ad spend increased 18% to $20.1 billion in the first half. "Consumers have been embracing mobile for the past three years, and marketers are just catching up," said Laura Desmond, CEO of Starcom MediaVest.

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