What are examples of high volume apps running on Google app engine? [closed]

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What are examples of high volume apps running atop of Google app engine?

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• pubsubhubbub (some projects that use it at Google)
• jaiku
• wokhei
• snapabug
• giftag
• overgrowth
• webfilings
• babelwith.me
• etc

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Google Moderator runs on App Engine, and ran whitehouse.gov's Open for Questions site for a while.

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BuddyPoke:

http://www.buddypoke.com/

http://highscalability.com/blog/2010/1/22/how-buddypoke-scales-on-facebook-using-google-app-engine.html

http://www.youtube.com/watch?v=0zz-oSrWfj0

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Michael Brunton-Spall gave an entertaining and informative talk at this year's Europython conference on implementing the Guardian's realtime voting system for the UK's leadership debates from the last election. This allowed users to vote up or down the three party leaders' performance over the space of each 90 minute debate. This was initially implemented in 3 days on App Engine and successfully handled 1 million+ requests during each 90 minute debate.

The video is available here.

He also did a talk on the Guardian Open Platform that Ron mentions in his answer. Video here.

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The Guardian newspaper in the UK, has developed "The Guardian Open Platform" as a means for 3rd parties to utilise their content. Core part of this platform is the "MicroApps" framework they've developed with Google App Engine.

http://www.guardian.co.uk/open-platform

http://googleappengine.blogspot.com/2010/05/microapps-from-guardian-and-google.html