are there any real applications running on google appengine? [closed]

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Are there any real production quality sites running on appengine? I've looked around and am finding mostly small applications.

Could someone please point me to some that get a high amount of traffic?

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Panoramio.com runs on App Engine, and I'm pretty sure it receives hundreds of thousands of hits daily as it serves the user images you see on Google Maps and Google Earth. Mind you, it was not originally developed in App Engine, it was eventually migrated there after the service got acquired by Google.

Also check out this StackOverflow question: https://stackoverflow.com/questions/2044595/what-is-the-largest-website-deployed-on-google-app-engine