Marketers Take Mobile Ads for a Test Drive

Facebook attracts advertisers who want to reach emerging markets
Ten percent of U.S. media consumption is done on smartphones; 1 percent of ad budgets are spent on mobile Illustration by Owen Gildersleeve

In the next few weeks, some iPhone users will start seeing mobile ads from Samsung, one of Apple’s biggest competitors and the maker of the hit Galaxy phone. The ads will offer as much as $300 to people who trade in their Apple device for a Samsung.

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