So You Want To Be A Facebook Entrepreneur?
If you haven’t done so yet, check out this post over at TestFacebook. Lots to think about before starting that venture centering around a Facebook application.
March 2, 2011 7:10 am 
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FriendRunner
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FriendRunner Alert monitors the Facebook Platform and automatically tests all Facebook's changes against your application. You'll be alerted to any problems that occur so that you can fix them before your users encounter them.
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To learn more about testing Facebook applications, be sure to check out Test Facebook.