Anyones facebook messages not showing up on lock screen on iphone?

Mine have suddenly stopped working:/ and don't know why. I've tried literally everything!:/

I know this is not an answer, but I'm having the same exact problem like I think it started yesterday night! I have an iPod~ the fb notification is just not showing at all. I did everything too like deleting fb app and dl it again. You think it might be that the fb app is having problems?