"peer-to-peer file sharing, heavy emailing and chatting online, and a tendency to quickly switch between multiple websites and other online resources all predict a greater propensity to experience symptoms of depression"
All of that sounds like normal teenager behavior in 2012. And seriously, what teenager isn't depressed. Their faces are all spotty, they have to sit in Trigonometry class, won't have gratuitous sex until college, curfew, living with parents, can't drink alcohol, etc. Just remembering all of that makes ME depressed.