It's been plastered all over Facebook, and in light of recent changes, it seems legitimate at first glance.
"Don’t forget TODAY starts the new Facebook (aka...new name, META) rule where they can use your photos. Don't forget the Deadline is today!!! I do not give Facebook or any entities associated with Facebook permission to use my pictures, information, messages or posts, both past and future. With this statement, I give notice to Facebook it is strictly forbidden to disclose, copy, distribute, or take any other action against me based on this profile and/or its contents. The information: The violation of privacy can be punished by law NOTE: Facebook is now a public entity. All members must post a note like this.
If you prefer, you can copy and paste this version. If you do not publish a statement at least once it will be tacitly allowing the use of your photos, as well as the information contained in the profile status updates. Thank you."
Notice how the post doesn't have a certain date? That's a great clue that it's false information. Logistically, Facebook employees do not have the time to go through every single page to search for this post, so it would likely not be seen even if it was legitimate. When you sign up for Facebook (or any other social media platform), you automatically agree to your content being accessible to Facebook employees for research and advertising purposes. You maintain ownership of your posts and all content will be deleted if your account is deleted.
Posting this false "disclaimer" is not legal in any way and does not absolve you from the terms and conditions that apply to each platform. Please take the time to read through the terms and conditions for each platform so you are fully aware of what you're signing up for.
Terms for Facebook can be found at facebook.com/legal/terms.