Question

why do tenagers spend lits of time on social networking sites

Answer 1

why do tenagers spend lits of time on social networking sites ?

____________________________

Почему десятки тратят много времени на сайты социальных сетей ?

Answer 2

because in the 21 st century people find ot addicting, while adults find it absurd (вроде так) when teens spend so much time on social net. sites. Teens usually visit those sites,because it is th easiest and nearly free way to talk to a person (especially from another country)
если что-то еще дополнить надо. Пиши