People will preorder for these bonuses now, people will pay to make their virtual farm bigger.

FORBES: DLC Running Wild: Preordering Paintball Mode

With more than 500 million active users logging on regularly to post an update, catch up with friends or tend a virtual farm, Facebook seems like fertile ground for connecting with consumers.

FORBES: Social Commerce: Luring Customers To Your Facebook Page

The developers make money through advertising and by offering users a way to pay for virtual goods in their games that could, for example, help them manage a virtual farm or defeat rival mobsters.

WSJ: Google Develops a Facebook Rival

As part of the Zynga Serve Rewards phased program, FarmVille players now have the ability to plant an interactive Serve Money Tree in their Farms which will give them the ability to level up in game and earn Zynga Farm Cash for virtual awards redemption.

ENGADGET: AMEX and Zynga team up for themed card, replace cash back with FarmVille rewards

Their plan: to create a "virtual car company" that would farm out most of the design, engineering and manufacturing work for the V-12 to outside suppliers.

FORBES: Magazine Article

Their plan: to create a "virtual car company" that would farm out most of the design, engineering and manufacturing work for the powerful V-12 to outside suppliers.

FORBES: Magazine Article

Players who visit the farm will collect Megamind-branded virtual goods to take back to their own farms.

FORBES: DreamWorks Rents A Plot Of Land In 'FarmVille'

The popularity of social network games, like "Happy Farm" or "House Buying, " is growing rapidly in China, but virtual sales from these games still generate only modest revenues.

CNN: In virtual world, China consumers best the U.S.