Starting today, you can create custom ad unit sizes for your website and there are 434,216 new options to choose from. We hope this update will help provide the flexibility you need to determine the best sizes for your site and allow you to focus on what’s most important -- creating quality content for your users and providing a great experience. 

To help make sure that the custom ad units ads continue to complement your site and create a positive user experience, we’ve put a couple restrictions around pixel size for your custom ad units. Learn more about the custom ad unit sizes on our blog (http://goo.gl/PCPxC5) and share your feedback with us by commenting below.
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