facebook/facebook-ios-sdk — pull request #476 by baoleihulu (2012-07-28 01:27:16+00:00)
Title: Fixed a potential crash after loading a feed dialog in some cases

Following the code posted on
https://developers.facebook.com/docs/howtos/feed-dialog-using-ios-sdk/

If ARC is enabled (but weak reference isn't enabled), by the end of the method, the facebook object is deallocated (as facebook is a local variable that exists only within the scope of this method). When the FBRequestConnection is calling completeDeprecatedWithData, the app crashes because local variable delegate refers to a zombie Facebook object.