I've never been a big fan of Jimmy Fallon, the American comedian, actor, TV host and musician.
Oh yeah I have heard of him, I think hes alright, Did you see the skit where he had the main 2 actors from the back to the future movie, that one was pretty funny. 
I didn't see that one. I do know that he is a cast member on Saturday Night Live and the host of The Tonight Show 
Yep, Say how long has he been hosting the tonight show anyways? 
Since 2014, he became the 6th host of that show!