The document discusses a case study of ESPN's InPlay mobile app, which provided a second screen experience for viewers watching the 2012 US Open Tennis Tournament. The app allowed users to participate in live trivia games and predictive questions related to the matches as well as view leaderboards and share on social media. It saw much higher than anticipated user traffic, with over 20,000 visitors per night and over 100,000 total users over the two week period. The case study examines best practices for driving audience engagement through mobile second screen experiences and key learnings around content, social integration, and measurement across platforms.