Some of them, specially the younger, cos the socially accepted "goal" of individualism and lack of deeper hopes.

Others, cos of loneliness, specially the ones that once hoped for love and live without.

Because we spend more time nurturing the surface than we do nurturing the depth in us.

Social detachment in real life can be one of the reason. Now a days more and more people keep themselves only to their lives.

Phone addiction

Reading Q's on SW, probably

Good question!

Many are just attention whores because they know there will be dumbasses that give them the empathetic validation they crave..