I don't play it, but find it quite amazing how big it's become practically overnight: http://www.bloomberg.com/news/articles/2016-07-19/nintendo-market-value-passes-sony-on-pokemon-go-frenzy-chart
Just make sure you know where you are going http://fox2now.com/2016/07/10/st-louis-area-robbers-targeting-pokemon-go-players/ In Saint Louis, robbers are setting up traps to lure in players then rob them.