Google's "exceptional" mobile advertising and data prompted eMarketer to revise its 2012 estimate for mobile-advertising spending upward, from $1.8 billion to $2.61 billion. Google already dominates the field, capturing 51.7% of mobile revenue, far ahead of Apple's 6.3% share. The competition is tighter in the area of mobile display, with Google at 24.8%, Apple at 18% and Millennial Media at 17.7%.

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