@WarnerCrocker
Well the sites are literally a conversation of black design patterns to make sure user eye balls stay as long as possible on them.
I'd assume that if that means that they trigger addiction pathways in the users so they come back, that's a sacrifice they are quite willing to take.
Kids, psychology is nowadays an important part of game design especially on "free to play" games to make sure that enough money comes in with the game publisher.