Comedic actor Jimmy Fallon first gained fame as a regular on the iconic NBC late-night television sketch comedy show "Saturday Night Live" (SNL). After SNL, Fallon acted in various movies for a few years before replacing "Late Night" host Conan O'Brien on NBC. Conan had taken over the spot for David Letterman in 1993, so Fallon is in good company with his new gig. Starting a TV show takes a lot of time and effort, and Fallon has been good about keeping fans in the know as the show was being crafted and through its launch in March 2009.
Fallon joined the Twitter nation in September 2008 and has sent nearly 1,000 tweets as of April 2009 [source: Twitterholic]. Fallon keeps fans in the know in his day-to-day life as the host of a popular late night show -- "Just got 4 deli platters from The Daily Show for me and the staff. Classy peeps. Thanks!" Fallon uses Twitter as a way to get fans to watch his show. His 765,000-plus followers are reminded about guests Fallon thinks are cool and worth tuning in for [source: Twitter].