What does my teen do all day with his cell phone?

Today in Switzerland, 99% of young people between the ages of 12 and 19 own a cell phone, according to the JAMES study. But what are these teenagers doing with their mobiles, several hours a day, every day? The answer lies in the list of their favorite sites, which are, in lʹordre: YouTube, far ahead of Google, Facebook, Instagram and Wikipedia.