How is Azure as a platform for Facebook Apps? I am looking in comparison to GAE (Google App Engine).
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A:
It seems to me they're both good platforms for Facebook apps, since they support building web applications which can scale if they become popular. I won't compare further, since I'm obviously biased. (I work on Windows Azure.)
However, if you're interested, I wrote a blog post about my own Facebook app running in Windows Azure: http://blog.smarx.com/posts/facebook-apps-on-windows-azure. That one's written in .NET, but we support PHP as well.