Business Insider writes, Apple's first TV commercial for the iPhone 5 (below) is titled "Thumb" and touts its new larger screen in relation to the size of the palm of your hand. The spot asserts it's just "common sense." Apple's ad agency is TBWA/Media Arts Lab. The ad began airing on network TV in the U.S. late Friday evening, the same day the phone first went on sale. It was posted to YouTube sometime after 9 p.m. (The timing is interesting because those hours are when viewership is at its lowest.) Apple doesn't need the publicity, of course. The launch of the new product is an event that earns its own free media....