Spending on mobile advertising is growing seven times faster than overall online spending growth, according to a ZenithOptimedia study. "By 2015 we forecast this total to rise to $33.1 billion, which will be 25.2% of Internet expenditure and 6.0% of all expenditure," the analysts write. In addition to the U.S., the top ad markets include the U.K., Australia, Japan, China, Germany and Brazil.

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