The document discusses game-based reward systems and proposes ideas for incentivizing user behavior on Yahoo Answers. It outlines different types of rewards, including currency, rank, mechanical, narrative, emotional rewards. It also discusses behavioral reinforcement using positive and negative stimuli. The key points are: 1) Rewards are more effective when distributed using varied intervals rather than fixed intervals. 2) Rewards work best when given based on number of interactions, not time alone. 3) Real-time reward notifications increase transparency and help users optimize their experience.