Have you posted the notice to your Facebook timeline to proclaim your copyright ownership of all content? Have you seen others from your social network posting such a notice? If you haven't already, don't bother. It's a hoax.
It's not even a new hoax. It's a resurgence of an old hoax that many users fell for earlier this year when Facebook became a publicly-traded company. The previous hoax implied that the change from a private company to a public one somehow changed the rules of the privacy agreement and put your posts and photos at risk unless you posted a copy and paste of a disclaimer establishing your copyright ownership.