A study this year by psychology students at Covenant College in Lookout Mountain, Ga. , found that the more time young people spend on Facebook, the more likely they are to have lower grades and weaker study habits. Heavy Facebook users show signs of being more sociable, but they are also more likely to be anxious, hostile or depressed. (Doctors, meanwhile, are now laming addictions to ‘night texting’ for disturbing the sleep patterns of teens. )

　　Almost a quarter of today’s teens check Facebook more than 10 times a day, according to a 2009 survey by Common Sense Media, a nonprofit group that monitors media’s impact on families. Will these young people get rid of this habit once they enter the workforce, or will employers come to see texting and ‘ social—network checking’ as accepted parts of the workday?

　　Think back. When today’s older workers were in their 20s, they might have taken a break on the job to call friends and make after-work plans. In those earlier eras, companies discouraged non-business-related calls, and someone who made personal calls all day risked being fired. It was impossible to imagine the constant back-and-forth texting that defines interactions among young people today.

　　Educators are also being asked by parents, students and educational strategists to reconsider their rules. “In past generations, students got in trouble for passing notes in class. Now students are good at texting with their phones still in their pockets, ” says 40-year-old Mr. Gallagher, the vice principal, ” and they’re able to communicate with someone one floor down and three rows over. Students are just fundamentally different today. They will take suspensions rather than give up their phones. ”

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