KATIE - Katie Couric looked to Facebook, with its one billion users and status as the world's most popular social media platform, to find out what people were really talking about in 2012. The year in review airs on KATIE, on WEDNESDAY, DEC. 12, distributed by Disney-ABC Domestic Television. (Photo by Donna Svennevik/Disney-ABC via Getty Images) PENTATONIX PERFORMANCE
06 Dec 2012
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