Update 15-Aug-2011: This fix only applied to the new version of the iPhone Facebook app back in April 2011. Any problems after April 2011 is probably not the same as the one described here.

I recently upgraded to the latest version of the Facebook iPhone app, but I’m not sure if that caused the problem.

When you attempt to open your News Feed, it shows “Loading” for a while before showing “No Internet Connection”. But obviously this is not the case, because if you try other pages such as Friends or Places or Profile, they work perfectly fine.

It appears as if the app has lost the authentication cookie or something, so the fix is trivial.

1. Tap on the menu at the top left (the icon with 9 squares) and tap the “Account” button (also at the top left) on the main menu screen
2. Choose either “Help Center” or “Account Settings” from the popup menu
3. You should see a login bar or login form - just fill up your details and login

That’s it! Logging in from within the app fixes the problem. Don’t try to select “Logout” from the popup menu - I tried it and it freezes the app.

It has been reported that this option may not work for everybody, but it did work for me.