Christakis said many teens are unaware of how public and permanent Internet information can be, while parents often do not know what their kids are up to.
"No one says, "Whoa! Why are you putting that up there?'" Christakis said.
In a second study, the researchers identified 190 individuals aged 18 to 20 whose MySpace accounts displayed multiple risky behaviors. Half were sent a message from "Dr. Meg" from Dr. Moreno's MySpace profile.
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