The mobile app industry has become a $100 billion industry due to several factors: 1) Mobile app revenue has skyrocketed from $0.25 billion in 2008 to an estimated $25 billion in 2012 as smartphone adoption increased. 2) Smartphone sales have risen dramatically while PC sales have dropped, with over 700 million smartphones shipped globally in 2012. 3) China has emerged as the largest mobile internet user base and smartphone market, with 245 million smartphones used in 2012. 4) Apps now command 80% of consumers' time spent on mobile devices, driven by social, games, and entertainment apps.