When Jeff Bezos arrives as expected at the Sun Valley conference -- the year's most exclusive meeting of media industry leaders -- he'll know much more about his fellow media moguls than they know about him. And that has them worried, especially as Amazon's advertising business picks up. From a report:Amazon's growing advertising business is poised to challenge the stranglehold Google and Facebook have on the internet's ad dollars, thanks to its growing dominance in e-commerce and growing presence in the media world. Google knows what consumers are interested in, and Facebook knows who you are. But Amazon has what many in the advertising industry regard as the most important piece of the puzzle: what people buy...read more >>