How to implement Single Sign On (SSO) using facebook ios sdk for iphone?

The method is used to determine if your application will 'handle' the url that is passed to it. For example, your application can handle a specific URL 'scheme' and then choose at runtime if it will handle the specific URL. IF you return NO, it will move on to other application that may also handle the same URL scheme.

Although, in the case of the Facebook iOS SDK, your application would be the only application handling the URL scheme.

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