As we all know, in the iOS 6 Beta 4, the dedicated YouTube application was removed from the device.
It was not found in the OS at all!
The only way to access YouTube was through Safari, which luckily works!
I didnt ever use YouTube so much before, but sometimes you need to listen to a song quickly and you dont have that particular song in iTunes/Music Application, you need to use YouTube, but since there is no YouTube any longer, you have to access it through Safari.
The only way to have quick access to YouTube is to make a Home Bookmark for Safari to YouTube.com
There is no other way to get YouTube back, or you can stay on Beta 3, but not for long as the Beta 3 will expire in a few weeks time.