The basic issue here is that Zynga isn't cool with the 30 percent cut that Facebook takes from customers using Facebook credits to purchase Zynga's in-game products.
That 30% is a huge cut. Zynga is said to be making about $300 million a year and only 1/3 of it is thru lead generation. That means Facebook could be getting 30% of the other 2/3 (or $200 million) which is $60 million.
