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London – Facebook says it is banning “deepfake” videos, the false but realistic clips created with artificial intelligence and sophisticated tools, as it steps up efforts to fight online manipulation. But the policy leaves plenty of loopholes.

The social network said late Monday that it’s beefing up its policies to remove videos edited or synthesized in ways that aren’t apparent to the average person, and which could dupe someone into thinking the video’s subject said something he or she didn’t actually say.

Created by artificial intelligence or machine learning, deepfakes combine or replace content to create images that can be almost impossible to tell are not authentic.

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

However, she said the new rules won’t include parody or satire, or clips edited just to change the order of words. The exceptions underscore the balancing act Facebook and other social media services face in their struggle to stop the spread of online misinformation and “fake news” while also respecting free speech and fending off allegations of censorship.

The U.S. tech company has been grappling with how to handle the rise of deepfakes after facing criticism last year for refusing to remove a doctored video of House Speaker Nancy Pelosi slurring her words, which was viewed more than 3 million times. Experts said the crudely edited clip was more of a “cheap fake” than a deepfake.

The problem of altered videos is taking on increasing urgency as experts and lawmakers try to figure out how to prevent deepfakes from being used to interfere with U.S. presidential elections.

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