I always thought the adsense content network was just a way for google to avoid paying publishers directly for listing their pages in their results. All content

I always thought the adsense content network was just a way for google to avoid paying publishers directly for listing their pages in their results. All content, including "bottom feeders" is valuable to Google. I believe it will come to a point that google will start paying publishers directly by a portion of the money they made by having their content in their results. As for facebook, I think it is overselling its ad business.