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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