I had that problem but then I disabled secure browsing and login approval on my pc then managed to log in on my 9900. I have since re-enabled my security measures
I had the same issue but with gmail. I tried everything I could think of, including changing my password. I'm not sure what I did but it eventually accepted it.
This happened to me on my 9700 recently. You have to go inro FB on the web, and change your primary email address to something else (a secondary account you have). Then you login to FB on phone using that email address.
You shoudl be able to change back after this. I don't know what caused the issue, but thsi workaround worked for me
Update your Facebook app from app world. I had this issue yesterday and I updated my FB in order for it to work. I had the "Your contract does not support the use of this application" sort of error.
i had the same problem here, and i solved it by changing my password to an easy one, my old password had simbols and caps, so that might be the problem. also check the language and keyboard input. good luck!