Who's winning the late night wars on YouTube? (exclusive)

Late night television in the US is hitting a new crescendo in the digital age. Nearly seven years ago the late night wars were dominated by scandals surrounding linear scheduling. Now, as viewers watch late night TV chopped up, on different devices and at different times, the war is being fought in online video views and the battlefields are YouTube, Facebook, Instagram, Twitter and Snapchat. 
Jimmy Kimmel Live, LastWeekTonight, Late Night with Seth Meyers