U.S. advertisers spend nearly $40 billion a year for online advertisements, but 31% of their ads are never seen. That means $12.4 billion will be wasted on U.S. online ads this year. That's the average across all sites; on some sites, only 7% of the ads were "in-view," meaning 93% of them went unseen. That sounds ominous for the health of Web content. But ad spending is up by over 20% this year. Online ad spending will exceed print magazine and newspaper ads for the first time this year. So, put another way, online ads in the U.S. are still...

Crazy numbers. What a waste of money.