This isn't the first time privacy chains have taken off. You can see in the chart above that "Facebook Privacy" searches jumped in January of this year (point A) when a similar slew of hoax statuses littered the site.
In fact, Facebook addressed previous "copyright memes" in this statement on the site, several years ago. Here's the gist of it: "Anyone who uses Facebook owns and controls the content and information they post, as stated in our terms. They control how that content and information is shared. That is our policy, and it always has been."
Your legal rights cannot be changed by a status. They are agreed upon when you sign up for the site (yes, if you are on Facebook, you agreed to its terms and conditions when you signed up). Everything Facebook can and can't use from your personal profile is outlined here, in the social network's exhaustive data policy.