Facebook app monetization typically results in very low earnings of $10 per 1000 daily active users from traditional CPM/CPC ads. However, some apps have been more successful by going beyond traditional ads to engage users. Mob Wars earns over $100 per 1000 users through in-app purchases. iLike connects musicians and fans, earning fees from sending users to purchase music. MineKey has potential to earn from reputation management and targeted ads based on user opinions. Engagement is the key to successful monetization on Facebook apps.