Researcher Lawrence Lam described some of the signs of excessive use spending at least five to more than 10 hours a day on the web, agitation when the teens is not in front of the computer and loss of interest in social interaction.

“Some spend more than 10 hours a day, they are really problematic users and they show signs and symptoms of addictive behavior … browsing the Internet, playing games,” said Lam, co-author of the paper which was published on Tuesday in the Archives of Pediatrics & Adolescent Medicine.