Everyone seems to ignore Facebook Credits as a revenue source. That market is still in the very early stages of development, but it doesn't take a lot of imagi

Everyone seems to ignore Facebook Credits as a revenue source. That market is still in the very early stages of development, but it doesn't take a lot of imagination to see some very profitable directions for it to go. In the short run, how much is FB extracting from Zynga alone with the Credits scheme?