You know how FA occasionally does something that shuts down the site so to speak? That's basically what happened there. Just check back later or tomorrow (depending on where you live and what time it is).
Oh, okay thanks.Facebook: you can check in, but you can't check out.
The part of the site you were trying to access is unavailable for a short time because they are doing work on it.How do I make my computer turn off at the same time every night?