Facebook and other technology companies use this photo-matching technology to tackle other forms of banned content, including child sex abuse and extremist imagery.
When you send your nude photo to Facebook, what exactly happens to it?
Facebook is running a test in Australia to fight revenge porn by asking users to send the company their naked photos so the images can be blocked.
"With its billions of users, Facebook is one place where many offenders aggress because they can maximize the harm by broadcasting the nonconsensual porn to those most close to the victim", Goldberg said. "Australia is 1 of 4 countries participating in a pilot with Facebook to help prevent sharing of intimate images".
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. In April it added the option for users to report pictures or video they are concerned have been shared without consent.
So, just in case a person's former lover decides to leak any of those pictures, one can take steps to prevent the images from being shared widely on Facebook or Instagram. It was even the topic of a Netflix documentary titled, "Revenge Porn".
After Australia, Facebook will test the new technology in the USA, United Kingdom and Canada, according to Mashable.
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Australia's e-Safety Commissioner Julie Inman Grant said Facebook is not storing the images, but only a digital footprint of them.
According to Facebook, the unwanted images will be stored for a short period of time before they are then deleted, to ensure the policy is being enforced correctly.
The user then reports the image and Facebook uses a cryptographic signature to identify that image, meaning that no else can upload it.
Facebook's technology will also work with Instagram.
By the way, "revenge porn" is a horrendous phrase.
In March, a private Facebook group of Marines, with almost 30,000 members, was outed for hosting hundreds, potentially thousands, of explicit photos of female Marines and veteran service members without their consent. Sexually explicit photos, and the threat of publishing them for the world to see, can then be used for blackmail.