App Makers Reach Out to the Teenager on Mobile

Over the past decade, advertisers have spent untold millions trying to turn Talia Kocar and her peers in the millennial generation into loyal customers. But on a recent afternoon in Santa Monica, Calif., in a kind of consumer torch-passing, Ms. Kocar, 25, watched a focus group of teenagers drink free Snapple and suck Doritos powder off their thumbs while answering questions about their smartphones.

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Fei XIao