Are you attached to the web? Haha, seriously however, are you?
Assuming you have the appropriate login e-mail and password (as well as you're linked to the web) there's a couple of points that could be creating your issues:
Can't Log Into Facebook Account
Are you getting a mistake message? If so, examine the Facebook help page for descriptions and also fixes to well-known issues.
See to it you do not have any extensions or antivirus programs running that are blocking Facebook.
Have you attempted clearing the app's cache? Go to Settings > Applications > Facebook > Clear Cache. If this doesn't function you can attempt clearing data also and also as a last option uninstalling and also re-installing the application entirely.
Did you register with your contact number? Make sure you enter the nation code also when logging in.
If the app is informing you to update your email address, this is probably since your email web server is classifying your Facebook e-mails as spam.
If you've lately enrolled in Facebook you may need to validate your account initially. If you've recently transformed your password, make certain you're trying to visit with the new password as well as not the old one.
If you're visiting via a browser, make certain you have cookies made it possible for and that facebook.com is included in your listing of safe sites.
Ensure you have one of the most recent version of the Facebook app for Android.