Tinder is the dating app that has reinvented the way we meet new people. Some are looking for love, others, are after a casual fling. The app has been downloaded more than 100 million times worldwide and it's the most popular dating app in Australia. In a joint investigation, Four Corners and triple j Hack reveal that the dating app has become a playground for sex offenders. Multiple women have come forward to speak with Four Corners guest reporter and Hack presenter Avani Dias. They tell their stories of assault at the hands of those they have matched with on Tinder.