announced, “I have to take a BlackBerry pause.”Plenty of people interrupt social and business meetings to check messages on their mobile devices. There was a time just a few years ago, Wohlschlegel recalls, when his employer didn't require him to have a BlackBerry. Now, as a spokesman for the influential American Petroleum Institute, Wohlschlegel is expected to be in constant contact with the world at large, fielding some 200 work e-mails a day.He doesn't have the option of tuning them out. But when…
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