Social media with a twist. Meet Badoo - The social network for meeting people to flirt with, meet up and have sex! This site is free to use but to message other people you'll need to upload a photo. Premium membership is available but it's not necessarily needed.
The site has apps for both apple products and android and it's easy to signup and meet people nearby or with similar interests. It doesn't necessarily have to be used to meet a fuck buddy, but there's no harm in trying!