But Android is gaining fast, up 690% since January according to Millennial Media
The business of selling ads on smartphones and other handheld devices is growing like gangbusters, but tracking it got a bit trickier after two of the biggest mobile ad networks were swallowed up -- AdMob by Google (GOOG) and Quattro Wireless by Apple (AAPL).
But the third, Millennial Media, is still independent and still churning out monthly snapshots of MOREPhilip Elmer-DeWitt - Aug 18, 2010 8:00 AM ET
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