Revenue from mobile ad sales more than doubled last year in North America and increased 82.8% to $8.9 billion globally, according to data from the Interactive Advertising Bureau's Mobile Marketing Center of Excellence, IAB Europe and global consulting firm IHS. Mobile search ads accounted for 52.8% of spending globally, followed by display ads. Regionally, Asia-Pacific and North America led in share of mobile ad sales, at 40.2% and 39.8%, respectively.

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