With tens (or perhaps even hundreds) of millions of people gaming on FB, any release has the potential to become a global hit. For example, Zynga Poker, Miniclip 8 Ball Pool, Candy Crush, Farm Heroes, and Coin Masters are all titles that boast over 10 million active users per month. Accordingly, you have the potential to also make the big leagues with your project, and even by hitting a million users, your revenue stream should become impressive. The ultimate success of the project will be determined by user engagement and several other factors that will be examined.