Facebook is looking at promoting a virtual currency that could be used to collect 30% of the sales of virtual game props, like those in FarmVille. That's the percentage that Apple gets of sales of applications on its iPhone.
The research firm ThinkEquity estimates that sales of virtual goods and all the rest on social networks and mobile phones could quadruple, to $3.6 billion, in the U.S. by 2012.
Read More at Business Week.