Good news if someone has hacked your Facebook account. There is now a procedure in place if your account has been compromised. If Facebook thinks your account is being used to spam, you will be sent an email directing you to a page so you can get it back. The first step is an overview giving you information about the process. The second step is a security check. You then have to verify your account and change your password in the third and fourth step. In the fifth step, you can restore your account.
Via Facebook Blog.
