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

　　lamingaddictions to

　　‘night texting’

　　for disturbing the sleeppatterns of teens.)

　　Almost a quarter of today's teens check Facebookmore 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 ‘social­network 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 after­work plans. In those earlier eras,

　　companies

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