According to the article:
A survey of 600 teens ages 13 to 17 in late April found that teens spend two hours per day online on average, 80% of which is spent using a social network. These same teens are, however, showing signs of “Facebook Fatigue.” Nearly one in five (19%) who have an account no longer visit Facebook or are using it less.
Of the group that are saying goodbye to Facebook, 45% have lost interest, 16% are leaving because their parents are there, 14% say there are “too many adults/older people” and 13% are concerned about the privacy of their personal information.
Here is more about the study.
Teens Study June 2010
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