According to Newsweek:
Facebook wants to pre-emptively prevent revenge porn on its platform by gathering nude images and videos of its users, raising privacy concerns among its 2 billion users.
The program is currently in its trial phase in Australia. Newsweek continues:
Facebook said it plans to use the images to build a database of specific photos it can then block from being uploaded to the site in future. If successful the trial will spread to the United States, as well as the U.K. and Canada.
THIS GUY'S OPINION: If you don't want the world to see them, don't share them. Even though Facebook may be doing everything within its control, it's just one of many platforms out there.