Tinder is a geo-location based dating app for mobile phones. A Grindr for straight people if you will. http://www.gotinder.com
Yeah, like everyone else said, use better pictures. Instead of using selfies, use a picture of you doing something (playing basketball, etc).
Good tip is if there's a caption on the picture that says www.hothookup.com it might not be a real person.
apparently, if you make an account, wait a day or two before you click yes or no, the first 10 ppl they show you after are all matches or people that have said yes to you.