https://www.sciencedaily.com/releases/2019/08/190823140736.htm

The study tracked young adolescents on their smartphones to test whether more time spent using digital technology was linked to worse mental health outcomes. The researchers -- Candice Odgers, professor of psychological science at the University of California, Irvine; Michaeline Jensen, assistant professor of psychology at the University of North Carolina at Greensboro; Madeleine George, postdoctoral researcher at Purdue University; and Michael Russell, assistant professor of behavioral health at Pennsylvania State University -- found little evidence of longitudinal or daily linkages between digital technology use and adolescent mental health.

"It may be time for adults to stop arguing over whether smartphones and social media are good or bad for teens' mental health and start figuring out ways to best support them in both their offline and online lives," Odgers said.