Just so you know, the internet is a creepy creepy place. There's a new website that you can pay 5 bucks to find if someone is on tinder and even where exactly they last used the app. It's legit too, apparently. Using the data available to developers.
http://www.theguardian.com/technology/2016/apr/05/tinder-swipebuster-spy-on-users-privacy-dating-app