SYDNEY, :Facebook is trying to combat "revenge porn" by encouraging users in Australia to submit their nude photos to a pilot project designed to prevent intimate images from being shared without consent.

Adults who have shared nude or sexually explicit photos with someone online, and who are worried about unauthorised distribution, can report images to the Australian government's eSafety Commission.

They then securely send the photos to themselves via Messenger, a process that allows Facebook to "hash" them, creating a unique digital fingerprint.

This identifier is then used to block any further distribution on Facebook, Instagram and Messenger as a pre-emptive strike against revenge porn, a common method of abuse and exploitation online.

"We're using image-matching technology to prevent non-consensual intimate images from being shared," said Antigone Davis, Facebook's head of global safety.

A Facebook spokesman said Britain, Canada and the United States are also expected to take part in the project.

"It removes control and power from the perpetrator who is ostensibly trying to amplify the humiliation of the victim amongst friends, family and colleagues," eSafety commissioner Julie Inman Grant told AFP.

Inman Grant said that if successful, the Facebook trial should be extended to other online platforms.

"The precedent already exists for the sharing of child exploitation images and countering violent extremism online, and by extending to image-based abuse we are taking the burden off the victims to report to multiple online platforms," she said.

Australia is among world leaders in efforts to combat revenge porn.

Its eSafety Commission launched an online portal last month, allowing victims to report cases where their photos have been shared on the internet without consent. The commission then works with websites and search engines to have them removed.

A recent survey by the commission showed one in five women in Australia aged 18-45 suffered image-based abuse, with Facebook and its Messenger app accounting for 53 percent of revenge porn, followed by Snapchat at 11 percent then Instagram at four percent.

Research by Melbourne's Monash University earlier this year found people were falling prey to abusive behaviour on a "mass scale", and that men and women were equally likely to be targeted.-AFP