The Wall Street Journal has a story about how the new advertising platform is gaining popularity is basically seems to cover the ads on other networks such as Google and Facebook.
Users downloading tools for decorating their Facebook or other social network page and when they do, it allows the developer the tools to place ads on top of the ads displayed on Google, Facebook, Yahoo, and others. The WSJ says they "put a layer of ads on your website or other paid ads covering up."
AdSense publishers have reason to be angry. They may be paying on a CPM and get anything out of this because their ads covered by third-party advertising.
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