Google-certified ad networks is now available to all publishers. “Allowing these ad networks to compete for your display ad space means that more ads will be eligible to appear on your pages, leading to potentially higher earnings in long run. Our system will show ads that generate you most profit, whether they're from Google-certified ad networks or AdWords program. As a reminder, all Google-certified ad networks are required to adhere to standards for user privacy, ad quality, and speed. In addition, you can use controls in your Ad Review Center to specify which ad networks can appear on your pages. We'll allow certified networks who comply with user privacy guidelines to show ads using these tools, but they won't be permitted to collect data from your site for subsequent interest-based advertising. You'll be able to opt out of receiving ads based on user interests from these certified networks, and we’ve changed our requirements for third-party ad serving to reflect this,” says Google.