Yik Yak is a pseudonymous social media smartphone application that initially launched in 2013 and relaunched in 2021. The app, which is available for iOS and (formerly) Android, allows college students to create and view discussion threads within a 5-mile (8.0 km) radius. It is similar to other anonymous sharing apps such as Nearby, but differs from others such as Whisper in that it is intended for sharing primarily with those in proximity to the user.