Does Hannah Hart count? I'd consider her a YouTube comedian. She has awesome puns and I'm always a fan of puns.
George Carlin, hands down. There is nobody who has crossed more lines to get to the truth than this man.
Yeah, not really into comedy, but I'll go for Jon Stewart as well. On the other side, I can't stand Jim Carrey!
I really like Mitch Hedberg, Bo Burnham, Aisha Tyler, the guys from The Blue Collar Comedy Tour, Ralphie May, and Gabriel Iglesias.
I can only narrow it down to my top three. (in no particular order). Eddie Izzard George Carlin Robin Williams
The fluffy guy, Gabriel Iglesias. There are so many actors that got their start in stand-up comedy. It's hard to choose. Tim Allen, Jerry Seinfeld, Jay Leno, are some of the more recent ones. One guy that always makes me laugh is Carrot Top. I'd also add Robin Williams and Jonathan Winters.