So that’s what Americans are doing with their time. Within three days of its release, “Pokemon Go” had more users than Twitter and, in its first week, easily became the most popular mobile game in American history. As a parent who watched his child spend virtually his entire allowance on Pokemon cards, I guess I should have seen this coming when the card players grew up and acquired smartphones. But who would have thought a game app would provoke official don’t-drive-and-play warnings — or help catch cheating boyfriends?!