The Foursquare Global Hackathon was a 30-hour event where developers from around the world came together to create innovative apps using Twilio's APIs. The event featured live demos, hack pitches, and a people's choice award, with three winners announced: VenueMachine, Sqavenger, and Fourhealth. The top Twilio + Foursquare mashups were showcased, including VenueMachine, which won the grand prize, and Sqavenger, which was also a People's Choice winner. The event highlighted the creativity and passion of developers, who built apps such as Postsquare, Bimbimbab, and others that leveraged Twilio's capabilities to create engaging experiences.