A new Gartner report projects that mobile ad spending worldwide will grow 74% this year to $913.5 million but not really accelerate until 2011, when advertisers are expected to boost mobile spending as part of an overall shift toward digital marketing channels.

By 2013, the research firm expects mobile ad spending to surpass $13 billion, with the Asia-Pacific region leading the way, followed by North America and Europe.

"After 2011, the trend will continue as smartphones and flat-rate data plans become more affordable to mainstream users," states the report, titled "Mobile Advertising Grows Quietly. "The growth in mobile advertising revenues is primarily driven by mobile Web banner ads, but it also has a strong growth component from mobile search, downloadable applications and SMS advertising."

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