Facebook's mobile-application ads have been tested by about 20% of the elite iOS developers, Chief Operating Officer Sheryl Sandberg says. That's good news for Facebook, which sees the ads as one of the few ways to earn revenue from its developer ecosystem on mobile platforms. "Facebook can't derive fees or virtual currency revenue from mobile apps, because they exist on platforms operated by ... Google and Apple. As users have migrated to mobile devices, Facebook's payments revenues has stalled because of this," Kim-Mai Cutler writes.

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