Why are so many people are playing Pokémon Go? For starters, it's lighthearted fun. Catching Pokémon is kind of like when you chased fireflies as a kid -- they're cool. You want to catch 'em, not kill 'em. And, hordes of Millennials are playing Pokémon Go out of nostalgia: They grew up on Pokémon and now it's on their single-most indispensable device -- the cell phone. Less obvious is the peer pressure -- which is a watered down way of describing social mood. Yes, I'm going there. And I can credibly say that we started "going there" with Pokémon back in 1999...