Jimmy Fallon has 8.5 million followers on Twitter, and his followers' comments frequently wind up generating material for his late-night talk show. Fallon's success comes partly because his tweets are funny, but also because they're genuine and written in his own voice, writes Carrie Kerpen. "Fallon always writes like he is interacting with real people on the other side of the computer screen and talks to them as such," Kerpen writes.

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