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The social-networking giant is undergoing a massive site makeover that brings music services and mobile advances along with some big steps in next-generation video sharing. The features are expected to be unveiled by Facebook on Thursday at its F8 developers conference, USA TODAY has learned.

Along with the site overhaul and redesign, the company will likely do a major update to its iPhone app and launch an iPad app soon, according to sources close to the company who were briefed on the plans but not authorized to speak on the record.

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