Sometime next Wednesday, celebrity scientist Bill Nye will take a seat in front of a computer and invite the internet to ask him whatever it wants. But he won't be taking the questions on Reddit, a medium famous for its "Ask Me Anything" sessions. Rather, Mr. Nye will be operating within the comments section of Gizmodo, a Gawker Media website on a page sponsored by State Farm. The entire interaction, from start to finish, will be an ad.After declines in revenue brought about by rising mobile consumption and real-time auctions for ads, publishers are working harder to offer advertisers creat...