A long-standing but often forgotten tip for building on Platform is to test your app against our beta tier (http://www.beta.facebook.com), which we push to every Sunday night. This gives you around 48 hours to confirm that your app will not have any issues with the code (features, updates, bug fixes, etc.) that we will be pushing to the full web tier on Tuesday afternoon.
To check to see if the beta tier has been updated, you can hover over the © symbol at the bottom of the Facebook homepage and compare the last number in the tool tip between the standard and beta tiers. If the numbers are different, it means the beta tier has been pushed.
If you find any new issues with your app while using the beta tier, please file a bug in our Bug Tracker with detailed steps on how to reproduce the issue and specify that you’re seeing this issue on the beta tier. This will help us catch issues before they are put in front of your users.
Jeff, a member of the Developer Relations team, is looking forward to helping get issues fixed even faster.