I tried and liked the iOS P2P app getLoopd.com. I suggested to a friend who is an event organizer, he and agreed to try it at one of his mixers. He encouraged us to keep our iPhones in our pockets while we talked with each other. And, between moving around the room, I selected who I wanted to connect with and they got back pretty fast. I think everyone had the same experience. Made some good connections for my business. From reading about the Tinder-like matching apps, I think getLoopd is a totally different beast - it doesn't roam anonymously. It uses Bluetooth so best when you talking with someone who is a few feet away.