August 3, 2010 9:00 am Study Finds Heavy Internet Use Can Trigger Depression Like pep rallies and pimples, the internet has become a fixture in the world of teenagers, but experts say when the net is the only social scene a teen has it’s a sign of a serious problem. Local 1:37 Pro-Palestinian protesters gather outside White House correspondents' dinner 2:05 How ‘Love Is Blind' made Vanessa Lachey and Nick Lachey's marriage stronger 0:44 At least 5 shot along Connecticut Avenue in Dupont Circle 1:36 O.J. Simpson's cause of death revealed 2:36 Super dad makes Mario-themed obstacle course for son's birthday