Google AdSense, has added a new ad unit to its existing ad formats. The new ad unit 200 x 200 pixels "supports text, image, and video ads, so using this format when opted in to both text and image ads will enable you to show a wider variety of ads on your pages."

Even though AdSense help center gives the link to the Ad Formats page, the size has not as yet been added it to the ad format page.

Google gives a set of instructions to add AdSense code to your site.

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