The phone. That is your drug for dopamine and the source for deppression sometimes. We are getting worse at social interactions because we get the same dopamine from our phone as realtime interaction. It's your daily cheatcode to achive things and a loss of your time, soon people will realize how little they have achived compared to people that has done the opposite. They will start feeling oppressed.
Dopamine makes you feel enjoyment, as you want more of.

This could be because of stress, because of less realtime interactions. Maybe social awkwardness.