Conan O'Brien's Team Coco YouTube Channel's videos have had 2bn views

"Conan O’Brien and his Team Coco YouTube channel have reached 2 billion video views and 3.5 million subscribers. It took five years to reach but, really, that’s a lot of post-late night viewing.
He still draws the youngest audience of any other late night show and is also drawing in traditional TV ratings along with his YouTube views. The show saw an 8 percent increase among adults 18-49 in December, versus November and a 5 percent  lift in January, versus December."

Source:  AdWeek, 26th January 2016