By July 2015, 20% of Starbucks's payments in the United States came through its mobile app. The company had created a tool to both drive loyalty and grow its customer base. No stranger to innovation, Starbucks was partnering with iTunes as early as 2007, earned its first mobile marketer of the year award by 2010, introduced its mobile app in 2011, and by 2015, 94% of Facebook users were either fans of Starbucks or friends with someone who was. This case explores the company's commitment to mobile and its social media prowess, and considers just what it takes to drive loyalty in a customer base.