Google AdSense
     Google AdSense  is a program run by Google Inc.  that allows publishers in the Google Network of content sites to serve  automatic text, image, video, and rich media adverts that are targeted  to site content and audience. These adverts are administered, sorted,  and maintained by Google, and they can generate revenue on either a per-click or per-impression basis. Google beta tested a cost-per-action service, but discontinued it in October 2008 in favor of a DoubleClick offering (also owned by Google). [2]  In Q1 2011, Google earned US$2.34 billion ($9.36 billion annualized), or 28% of total revenue, through AdSense. [3]     Google uses its Internet search  technology to serve advertisements based on website content, the user's  geographical location, and other factors. Those wanting to advertise  with Google's targeted advertisement system may enroll through Google AdWords.  AdSense has become a popular company in creating and placing banner  advertisements on a website, ...