If you are looking to find out who’s using AMP, and how they are using AMP then checkout out Chrome extension, AMPInspect. It’s simple, it’s free and you can install it in just a few clicks.
After you install the AMPInspect icon it will show you the AMP components that are in use on the active website. You can then click on any of these components to be directed to their respective page on the official amp.dev website. Test it out yourself, install the extension and click on the icon in your browser window on this page.
You can download the AMPInspect extension here.
At present the AMPInspect extension does not show any errors or warnings for AMP pages, so for site owners use the error index feature of the official AMP plugin or else the “AMP Validator” Chrome extension.