Read the details. It has to do with the way GAAP applies to virtual goods. GAAP makes you book the revenue over the "estimated average life" of the good where

Read the details. It has to do with the way GAAP applies to virtual goods. GAAP makes you book the revenue over the "estimated average life" of the good whereas Zynga's non-GAAP measurements book the revenue all up front when the good is sold.