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Facebook has announced plans to remove any videos doctored using artificial intelligence (AI) from its social networking platforms ahead of the upcoming US presidential election.

The videos, known as deepfakes, are modified to look real and have been shown to be highly convincing and difficult to debunk online.

In a blog postthis week, Facebook admitted thatdeepfakes present a significant challenge to technology and social networking sites, but promised to tackle all types of manipulated media.

Deepfakes are videos in which AI has been used to superimpose the face of a person onto the body of another.

The controversial practice first made headlines in 2017, when internet users published pornographic videos featuring the likenesses of female celebrities including Taylor Swift and Katy Perry.

Most of the sites hosting the videos subsequently removed the content and banned them from their platforms, but fake footage featuring high-profile figures from a variety of different fields has continued to spread online.

While these videos are still rare on the internet, they present a significant challenge for our industry and society as their use increases, writes Monika Bickert, vice president of global policy management at Facebook, in the blog post.

The social media giant, which also owns Instagram, has pledged to removed doctored videos if it wasnt obvious to an average person that they have been edited, or if they give a false impression that the subject of the video has said or done something that they have not.

There are people who engage in media manipulation in order to mislead, warns Bickert in the blog.

Banning deepfake videos is part of Facebooks attempts to get ahead of a wave of new misleading media and content expected to be shared in the run-up to the election in the US in November.

Some critics argue that Facebooks new policy does not go far enough. For instance, the ban on deepfakes will not apply to videos deemed to be parody or satire.

The social network was criticised last summer for refusing to remove a viral video of US House of Representatives Speaker Nancy Pelosi that was doctored to make it sound like she was drunkenly slurring her words.

In a statement toReuters this week, Facebook said: The doctored video of Speaker Pelosi does not meet the standards of this policy and would not be removed. Only videos generated by artificial intelligence to depict people saying fictional things will be taken down.

So-called shallow fakes videos made using conventional editing tools and not edited by AI will also still be allowed.

To date, there have been no major examples of deepfake content being uploaded to Facebook platforms that would break the new rules.AsThe Guardiannotes, themost damaging examples of manipulated media in recent years have tended to be created using simple video-editing tools.

But computer scientist William Tunstall-Pedoe, whose AI companyEvi invented the technology behindAmazons Alexa, told the BBC that Facebook deserved credit for trying to tackle the difficult area.

The fact the video is fake and intended to be misleading is the key thing for me, he said. Whether sophisticated AI techniques are used or less sophisticated techniques isnt relevant.

The multinational is still dealing with the fallout of being accused of allowing the spread of disinformation during the 2016 presidential election and the 2018 US midterms.

AndFacebooks reputation has taken a furtherhit from its involvement in the Cambridge Analytica data harvesting scandal and controversies over targeted political advertising.

The resulting pressure from lawmakers, journalists and activists to crack down on the spread of misleading or false information may be a major factor in the new ban on deepfakes.

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Why everyones talking about Facebooks deepfake ban - The Week UK