The document discusses social games, gamification, and loyalty programs. It notes that 90% of new players on Zynga games come from other Zynga games, showing the importance of retention and loyalty. It also discusses how social games encourage the most active 2% of users to drive engagement, and how gamification uses game mechanics and design to motivate user behaviors. The document concludes with recommendations for building social loyalty programs, such as designing for frequent re-engagement across multiple platforms and ensuring rewards matter to users.