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YouTube revisits 2012's top viral videos

From PSY's Gangnam Style to Canadian pop star Carly Rae Jepsen's Call Me Maybe, YouTube is revisiting the year's most-watched videos in its annual Rewind list. John Northcott reports.
From PSY's Gangnam Style to Canadian pop star Carly Rae Jepsen's Call Me Maybe, YouTube is revisiting the year's most-watched videos in its annual Rewind list. John Northcott reports. 3:37