Apple's iPhone has retaken the lead in ad traffic from Google's Android, according to an Opera report for the first quarter. Apple devices delivered nearly half of eCPM mobile revenue, the report said. Mobile ad traffic in the U.S. dropped from 60% in the fourth quarter of 2012 to 50.7% in the first quarter, although it still accounts for three-quarters of global revenue. Europe's traffic rose from 14.6% to 21.5% during the same period.
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