A new Canadian study has drawn a link between social media screen time and depression in teenagers.
Researchers studied the behavioural habits of 3,800 students, grades 7-10, from 31 Montreal schools beginning in 2012.
The study - carried out over four years by researchers at the Sainte-Justine Hospital in Montreal - was published Monday in the American peer-reviewed journal JAMA Pediatric.
Researchers called it the first study of its kind that presents a "developmental analysis of variations in depression and various types of screen time".
Screen time was measured by asking students how much time they spent on social media sites such as Facebook, playing video games, watching television shows or movies, and on the computer.
"What we found over and over was that the effects of social media were much larger than any of the other effects for the other types of digital screen time," said Patricia Conrod, the study's team leader and University of Montreal psychiatry professor.