From CNN:
1. You lose sleep over Facebook
2. You spend more than an hour a day on Facebook
3. You become obsessed with old loves
4. You ignore work in favor of Facebook
5. The thought of getting off Facebook leaves you in a cold sweat
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References:
Five clues that you are addicted to Facebook. CNN.
Online social networking may 'harm health' due to reduction of face-to-face contact
Don't work (or browse) so hard. Beware of Internet addiction
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