It takes 4 days for Facebook to totally fix the login problem for their iPhone Facebook app but also required three times updates to get the job done. Thus if you are one those who have installed the previous version, and facing this inconvenient login problem then it’s time to update to this latest and newest version which is Version 3.2.2 to solve the said problem

Facebook for iPhone 3.2.2
Here is the official Facebook announcement on what Facebook Version 3.2.2 offers:
– Fixes login issues
Note: Places is only available for users in the US at the moment. We’re working on making this available in other countries soon.
Then go ahead, update yours to the latest Facebook version 3.2.2 app for iPhone here
This problem was also apparent on Android, which still hasn’t been fixed by Facebook.
Facebook has such mistakes and everyone is using facebook. I don’t understand. It has million members and they can’t fix the mistakes.