How do I close my facebook account temporarily?

[Marwan]

Account ---> account settings ---> Deactivate account

If you deactivate your account from the "Deactivate Account" section on the Account page, your profile and all information associated with it are immediately made inaccessible to other Facebook users. What this means is that you effectively disappear from the Facebook service. However, if you want to reactivate at some point, we do save your profile information (friends, photos, interests, etc.), and your account will look just the way it did when you deactivated if you decide to reactivate it. Many users deactivate their accounts for temporary reasons and expect their information to be there when they return to the service.