Laura Higgins, of the Professionals Online Safety Help-line, says parents are often to blame.

BBC: Cyberbullying may force out young teachers, says union

"These are kids who argue with their parents, who refuse to follow through on chores, maybe argue with their teachers, blame other people for their own mistakes, " says Margaret Keyes, a University of Minnesota research psychologist who led the study.

NPR: Adopted Teens Face Higher Risk for ADHD