There is an interesting rumor going around right now about just how exclusive Jimmy Fallon's guests are on The Tonight Show.
TMZ is the source behind the rumor, and has several sources close to NBC that confirm the rumor.
To find out what it is, you can check out the entire story that they've written up on the whole matter: http://scaryto.me/1cHIKJE
I have to admit that it's pretty interesting, and I've never heard of any policy in place quite like it before. However, when you're ratings hungry, anyone will go to whatever length it takes to ensure that they dominate.