Ключевые слова: 14s, 15s, absorbed, activity, adolescents, apps, assistance, austrian, boys, break, caucasian, class, classmates, college, enjoying, european, females, friends, games, german, girls, group, help, indoors, information, interest, internet, lesson, males, obsessed, pastime, playing, recess, school, search, smartphones, students, surfing, swede, teenagers, time, university, using, young, youth,