It’s no secret that the new Foursquare app has eliminated check-ins. But the company still needs users to leave reviews at local joints without getting that pat-on-the-back from badges. Enter: Expertise. People will earn “expertise,” and when they write tips that other users like or save, a little pink “expert” status bar will fill up. Eventually, you’ll be flagged in the reviews as an “expert” in “pizza places” or “sushi” or “dance clubs,” and the world shall know your power. Or something.