The popularity of internet-based social networking services such as Facebook has surged over the previous decade, with more people than ever using these tools to connect with their friends and family. These services are lacking, however, when it comes to helping users engage with others based on mutual interests for daily, location-based activities such as going to the gym, sharing a meal, or studying for an exam. OnTheFly is a multi-platform mobile application which leverages the user's existing Facebook connections to help facilitate this process, providing users with an easy, intuitive method for creating short-term events they want to share with others. OnTheFly is designed to both support existing friendships as well as encourage new ones; users can invite their existing Facebook friends to events, and privacy settings allow users to choose whether they share their event with existing friends only, or open it up to the entire OnTheFly community.