Are you linked to the web? Haha, seriously though, are you?
Assuming you have the appropriate login email as well as password (as well as you're attached to the internet) there's a few things that may be causing your troubles:
Cannot Login To Facebook
Are you getting a mistake message? If so, check the Facebook help page for explanations and fixes to known problems.
Ensure you do not have any type of expansions or antivirus programs running that are blocking Facebook.
Have you tried clearing the app's cache? Most likely to Settings > Applications > Facebook > Clear Cache. If this does not function you can attempt clearing up information also and as a last resource uninstalling and also re-installing the app completely.
Did you join your phone number? See to it you key in the nation code too when logging in.
If the app is informing you to update your e-mail address, this is more than likely since your e-mail server is labeling your Facebook e-mails as spam.
If you've lately registered for Facebook you could require to confirm your account initially. If you've recently altered your password, see to it you're attempting to visit with the new password and also not the old one.
If you're visiting through an internet browser, make sure you have cookies made it possible for and that facebook.com is included in your listing of safe sites.
Ensure you have the most recent version of the Facebook app for Android.
