An extremely successful online game with an exceedingly simple premise - put together a virtual farm - FarmVille is popular with seemingly every Facebook user. An exaggeration, perhaps, but not completely unrealistic.
And, in order to spruce up your farm and make it look better than the next virtual farmer, you need to earn more FarmVille Cash. FarmVille Cash allows you to buy exclusive items for your farm and, overall, spruce it up above and beyond the norm.
