the popular comedy and talk show channels on YouTube were:

1. "The Late Show with Stephen Colbert"
2. "The Tonight Show Starring Jimmy Fallon"
3. "Conan on TBS"
4. "Jimmy Kimmel Live"
5. "Last Week Tonight with John Oliver"
6. "The Daily Show with Trevor Noah"
7. "Late Night with Seth Meyers"
8. "The Late Late Show with James Corden"

This list is not exhaustive and is subject to change as new content creators emerge and viewer preferences shift.