eBay noted that Paypal represents 50% of total payments on Facebook, and by the end of ‘09, gaming company Zynga was the 2nd largest Paypal merchant after eBay. Paypal had $500MM in virtual goods revenue in ‘09, which was 2x from ‘08, and we believe this could grow by 50% in ‘10.
Another gem [pdf] from Mark Mahaney at Citicorp.
Source: rafer
