Facebook for iOS version 4.0 - Upgrade Issues

People updating their Facebook app on iPhone to version 4.0 might experience "freezes" and "lockups" after launching the app. The blue Facebook launch screen (sometimes with the spinning icon) will persist, though nothing further seems to happen. In some cases even the "Home" and "Power" button will stop responding causing the phone to lock up completely.

The only solution is to wait for the iPhone to "recover" (usually after the SpingBoard crashes and relaunches itself),  and follow these steps after you regain control over the device:

• Double-click the Home button to display recently used apps
• Hold one of those apps, until they all start to wiggle
• Close all the recently used apps
• Click the Home button to stop the wiggling
• Click the Home button again to close the recently used apps
• Hold the Facebook app, till all the apps start wiggling
• Delete the Facebook app (and all of its data)
• Power off the iPhone by pressing (and holding) the Power button
• Restart the iPhone by pressing the Power button
• Re-install the Facebook app using the App Store app on the iPhone
• Launch the Facebook app
• Provide your Email/Password and log in

Note: Seemingly only the iPhone and iPod Touch are affected (not the iPad), and only when upgrading the Facebook app