http://www.hollywoodreporter.com/news/study-jimmy-fallon-spends-time-717565

Fallon talks (http://www.salon.com/2014/07/11/fallons_fallacy_what_we_lose_and_gain_as_talk_shows_abandon_the_talk/) just 37% of the time, down from 51% for Jay Leno, according to a study by “TV’s Greatest Talk Shows” author Stephen Winzenburg, a communications professor. Craig Ferguson is the next lowest at 43%, followed by Jimmy Kimmel (48%), Seth Meyers and David Letterman (51%) and Conan O’Brien (53%).
Read more at http://www.hitfix.com/tv-tattle#SV7OwfD0tpI4Oytz.99

http://www.esquire.com/blogs/culture/fallon-changing-late-night-for-the-better

"When guests come on Fallon, there's not an intimidation factor like there might be on Letterman or even Kimmel or Conan,” explains Ryan Bort. “They know they have nothing to worry about and that Fallon is not going to challenge them in anything more consequential than a grade-school game. They can relax, they can have a good time, they can be themselves (as much as possible in front of a camera, anyway).”
Read more at http://www.hitfix.com/tv-tattle#mvx80usWAxmkS0UO.99