The current version of the "Facebook Black" scam uses a browser plug-in to continually re-share the scam message and tag random friends in that message. If you have a friend who has fallen for the scam, (or any other ), and they can't seem to stop it from posting, guide them to follow the directions below.
Step 1. - Precautionary Measure (Clean Up Your Facebook Apps)
Please follow the directions given in the Facebook help topic below. It will tell you how to remove any bad apps you may have installed on your Facebook account.
How do I remove or delete an app from my account?
Step 2. - Removing The Rogue Browser Add-on Associated with (Facebook Black)
Once you've finished Step 1, read the following topic on my site for help with dealing with Rogue Browser Add-ons.
Help Topic - How To Avoid Rogue Browser Plug-ins. - (Browser Additions)
See the section marked "Getting Rid of a Rogue Browser Addition." Below it, the Resources section will help you figure out how to remove any bad browser add-ons you may have installed in your browser.
Step 3. - Precautionary Measure (Change Your Password)
Changing your password will ensure it wasn't compromised during the spam attack. It will also ensure no one is posting spam through your account because they have your login information or your "Post By Email" address.
How do I reset my password? (This Will Only Allow You To Reset Your Password)
The link below goes to Facebook's Account Recovery Page. This security feature will allow you to regain full control over your account after it has been compromise by Phishing or hacking. The process will allow you to reset your Facebook Password, Security Question and Your "Post By Email" Address.
Facebook's Hacked Account Recovery Process.
Step 4. - Profile Clean Up
Once you have completed steps 1 through 3 it is necessary for you to remove all of the post that have been made to your profile, that points your friends to the scam. You don't want others falling for it. The Facebook help topics below show you how to remove items from your Timeline.
How do I delete something posted on my timeline?
How do I remove a link that I posted?
If the scam has created Fan Pages, Groups or Events as you, these Facebook help topics will show you how to remove them.
How do I delete a Page?
How do I delete a group?
How do I delete or cancel an event I created?
PS> Even though I've listed these clean up instructions in conjunction with the Facebook Black Scam, they are not only for that scam. These instructions can be followed ANY similar scam on Facebook.