Second, when I did go back, I realized I was just endlessly scrolling - a behavior the UI encourages - looking for anything interesting in the sea of memes, sel

Second, when I did go back, I realized I was just endlessly scrolling - a behavior the UI encourages - looking for anything interesting in the sea of memes, selfies, and nonsense. You pull down... something spins... sometimes you get a reward. Can it really be pure coincidence that Facebook and one-armed bandits have exactly the same UI?