Need more info than that. There is a link in my signature that can help you in the future, but for now I'll throw you a bone.
What device?
If its a computer, have you tried a different browser? Can you ping
www.facebook.com?
If at home, do you have another computer you can test it on?
Point is, need to have some more details before it is really worth trying to answer. You can be vague in real life because people can respond by asking 20 questions and get to the heart of the issue in a short period of time. On a forum though, sometimes there can be hours or days of lag between the responses.