1. Advertising + Virtual Goods (selling "items" or "currency" inside a game for power, pleasure, or status) 2. You can't really "collect" the data. Facebook's

1. Advertising + Virtual Goods (selling "items" or "currency" inside a game for power, pleasure, or status) 2. You can't really "collect" the data. Facebook's Terms state that you can't keep user data for longer than 24 hours. The original idea was that you could use their data to display demographically-relevant ads.