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In this image released by NBC, Will Smith, left, and host Jimmy Fallon act out the evolution of hip-hop dancing on the premiere of "The Tonight Show Starring Jimmy Fallon," in New York. One month in, and NBC’s generational trade of Jay Leno for Jimmy Fallon at the “Tonight” show is succeeding beyond the dreams of network honchos. Fallon’s fast start is clear in television ratings and even more so in social media metrics. (AP Photo/NBC, Lloyd Bishop)

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This image provided by NBC shows Jimmy Fallon, left, and first lady Michelle Obama dancing on the set of Late Night with Jimmy Fallon, Friday Feb. 22, 2013 in New York. The dance was part of Obama's “Let’s Move” campaign. (AP Photo/NBC, Lloyd Bishop)

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This photo released by NBC shows, Johnny Sequoyah as Bo, in the pilot of the new NBC television series, "Believe." Alfonso Cuaron and J.J. Abrams ("Lost," the "Star Trek" movies) are executive producers of "Believe," a drama about a child whose supernatural powers put her and the world at risk. (AP Photo/NBC, Eric Liebowitz)

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This photo released by NBC shows Sienna Guillory, left, as Moore, and Johnny Sequoyah as Bo, in the pilot of the new NBC television series, "Believe." Alfonso Cuaron and J.J. Abrams ("Lost," the "Star Trek" movies) are executive producers of "Believe," a drama about a child whose supernatural powers put her and the world at risk. (AP Photo/NBC, Eric Liebowitz)

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This Feb. 24, 2014 photo released by NBC shows, from left, Carson Daly, Natalie Morales, Savannah Guthrie, Matt Lauer, Al Roker, and Ronan Farrow on "Today," in New York. After winning in the ratings for two weeks during the Winter Olympics _ NBC's first weekly wins since the London games in summer 2012 _ the "Today" show has kept some of its momentum now that Matt Lauer, Savannah Guthrie and the team are back in the New York studio. (AP Photo/NBC, Peter Kramer)