Jimmy Fallon’s late-night show hasn’t been on the air three months, but he’s already got an award. The comedian was chosen as person of the year by the annual Webby awards for being “one of the most ardent online evangelists.” The 13th annual Webbys were announced Tuesday. A special achievement award was also given to Nine Inch Nails frontman Trent Reznor, who released his 2008 album, “The Slip,” as a free download. Seth MacFarlane, the “Family Guy” creator, was honored as film and video person of the year for his Web franchise “Cavalcade of Cartoon Comedy.”