Agreed. SOME may behave this way, but without more info who are we to say that they "are predisposed" in general. Teenage years are very hard for tons of reason

Agreed. SOME may behave this way, but without more info who are we to say that they "are predisposed" in general. Teenage years are very hard for tons of reasons mentioned above and the way people handle those stresses comes down to tons of factors, support systems, upbringing, context, culture, etc. Facebook is immorally exploiting that stress.