Twitter is the latest platform to ban a new type of pornographic video that replaces the original actor's face with that of another person.
The clips, known as deepfakes, typically use the features of female TV personalities, actors and pop singers.
Unlike some social networks, Twitter allows hardcore pornography on its platform.
But it said deepfakes broke its rules against intimate images that featured a subject without their consent.
The San Francisco-based company acted six hours after a Twitter account dedicated to publishing deepfake clips was publicised on a Reddit forum.
News site Motherboard was first to report the development.
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Deepfake pornographic videos banned by Twitter - BBC News