There are many people starting their carrier on Youtube first. Do you have favourite one? I really like one guy making original acoustic music with his family and friends - Noah Gundersen.That’s one song from him live
i like chester see
i heard him sing couple of times
he is good
not as good as chester Bennington though 
haha obviously
i especially like the song with chester see in it featuring nigahiga
I don’t have a favourite artist on youtube. Except LP of course 
But just yesterday, I’ve got a new follower on twitter. He’s a musician and I found this video of him on youtube. It’s very good. If you like Radiohead, you are gonna be happy with it.
http://www.youtube.com/watch?feature=player_embedded&v=Pi2DwTYBRQM#!
Dumbfoundead, Traphik, Eppic, DeStorm, Alex G, Kina Grannis…those are just a few i like…lol