Tinder is an online dating, social and matchmaking application for smartphones. Anyone and everyone is allowed to join this community. Just don't expect it to be like facebook or something. Members who have similar interests, locations and other details will be "matched" up according to those scores based on their Tinder accounts. If you accidentally deny the person or block someone, it's permanent. Tinder supports iOS 7+ and Android 2.3+ as well as your internet browser. Your Tinder account will sync with your facebook account to ensure you have the correct information. Basically, if your facebook is wrong, your profile will be wrong. It seems this application and service is completely free to use Tinder.