Given the rapid uptake of smart phones, and heavier use of smart phones for mobile web and mobile apps, InMobi also says growth of mobile impressions on smart phones was about 488 percent in 2011.
In North America, mobile impressions grew 366 percent while smart phone impressions grew 625 percent, inMobi says.
Tablets also were a new factor, with tablet impressions increasing 771 percent year-over-year, to 11.2 billion. Review of 2011 mobile ad growth
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