Nearly two-thirds of full-time workers own smartphones, up from 48% just two years ago, according to the Pew Research Center. One-third own a tablet, up from 12%. The exploding use of
these devices has created a workplace domino effect: If one person answers the boss's e-mail after hours, others feel compelled to as well. "There's an arms-race component to this," says Lee Rainie,
who directs the Pew Research Center's ongoing study of technology's social impact.
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