Why won't my iPhone log into the facebook app?

I press 'continue' to log in and the little white loading circle comes up and stays there forever. I don't understand why I can't log into facebook on my phone bt it's really starting to cheese me off. I've deleted and redownloaded the app twice now, can anyone help me out with this?

Just click not me and re-write the email and password and click log in.

You should check your connection… If it doesn't work try reset network setting by tapping Settings > General > Restore > Restore Network Settings! If it still doesn't work then try log out and then log in with your Apple ID to redownload the Application

Note: if you have a jailbroken device then it might not work!

Try turning your phone off for five minutes and turning it back on

Reset network setting by tapping Settings > General > Restore > Restore Network Settings! If it still doesn't work then try log out and then log in with your Apple ID to re download the Application