There's a gap between which vertical sectors lead in mobile searches and which attract the most mobile-ad spending, writes Mark Walsh. Only the travel vertical, which includes search for gas stations, hotels and transportation, made the top three in both categories, according to xAd. Tactically, display ads based on mobile search grew the fastest, while more than half of campaigns employed geofencing and the use of geotargeting declined from 64% to 13% during the study's period.

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