Dangers of the Internet
Dangers of the InternetiStock

Psychologist John Van Dreal has spent almost 30 years working with troubled kids. Still, it's always unsettling to get the kind of phone call he received one morning eight years ago as he was on his way to a meeting.

"I got a call from the assistant principal at North [Salem] High, reporting that a student had made some threats on the Internet," remembers Van Dreal, the director of safety and risk management for Salem-Keizer Public Schools in Salem, Ore.

"There were a number of statements about hitting people with pipes, breaking knees, bashing heads with pipes and looking for help in doing so," Van Dreal says.

He adds that students who saw the post were frightened. They told their parents, who called the school administration. Faculty and staff were worried, too, he notes. This particular student had been in trouble before, but this time it felt different.