Hello, thank you for reporting this, but yes indeed, Facebook was having some issues for a while, but it should be up and running again! Please let us know if you are still experiencing issues. I would also suggest binding your account to an email address, so you can still login if Facebook is having issues. You can bind your account through the User Center, linked below.

https://www.oasgames.com/?a=newucenter&lang=en&source=narutoenosite