Of the 13,000 ads running on magazines' tablet editions in the second half of 2012, 9,500 were interactive and half of readers who saw them engaged with them, according to Starch Digital data from GfK MRI Starch Advertising Research. The automotive category -- for example, an Avis rent-a-car ad instructing readers to "Move/turn/shake" -- led the field in inspiring interaction, according to the study.

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