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A doctored video purporting to show Joe Biden addressing a rally and forgetting which state he was in was viewed more than 1.1m times on social media before it was removed from Twitter.

“Hello Minnesota,” the Democratic candidate says as he bounds on to a stage where signs saying “Tampa, Florida” and “Text FL to 30330” are prominently placed.

The footage was clipped from a campaign stop last Friday in St Paul, Minnesota. The signs, however, were fake, added by digital manipulation, according to an Associated Press fact check that debunked the story.

Late on Sunday, Twitter tagged the video, which was posted on a nondescript personal account, as “manipulated media”. Shortly afterwards, with the video