Apple has revealed that YouTube is the twelfth application on the iPhone. We have all wondered out loud about the lack of balance shown on the iPhone’s Home screen, what with two rows of four icons, and a third row with only three. Then one of the iPhone commercials gave a peek that there would be twelve, but we just couldn’t see what it was. Now we know. In conjunction with releasing YouTube on Apple TV, the company made it know that a customized YouTube viewer application would ship on the iPhone as well.