Facebook's Doug Purdy says more than 550 million people use third-party applications through the Facebook platform, sharing a billion "stories" a day. Mobile has become integral to Facebook's fortune and to the multiple-device platform universe driving its recent acquisition of Parse, Purdy notes. "We live in this world of heterogeneous devices. We're trying to build a platform where third-party developers can create applications that span across all of those devices so they can really focus on people," Purdy says.

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