The bit of game theory they actively present is Seinfeld's "Don't Break the Chain" technique. Snapchat marks and elevates contacts you individually snap at at least once a day, moving those contacts into more-and-more personally named categories ("close friend", "best friends", etc).
That bit is right in your face and rewards you for increased use.
I had no idea that was the case, but that's some next level psychological shit to be pulling on a predominantly teenage customer base. Does no one see the proposal to do something like this and think to step back for a second and consider the effect its going to have on people's lives?
That bit is right in your face and rewards you for increased use.