Twitter has labelled 300,000 tweets related to the US presidential election as "potentially misleading" in the two weeks surrounding the vote, making up 0.2% of election-related posts.

The social network said the labels were issued between 27 October and 11 November, one week before and after the election on 3 November, which Democrat Joe Biden won over incumbent Donald Trump.

Of the 300,000 flagged tweets, 456 were covered over by a warning message and had engagement features limited, meaning users could not like, retweet or reply to the posts, Vijaya Gadde, Twitter's head of legal, policy and trust and safety, said in a blog post.

She estimated that 74% of people who saw the problematic tweets did so after they had been labelled as misleading or flagged with a warning message, and sharing of the posts, as a result, declined by about 29%.

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During the election period, Twitter posted messages on American users' pages which were seen 389 million times that "reminded people that election results were likely to be delayed, and that voting by mail is safe and legitimate," Ms Gadde added.

Nearly half of President Trump's tweets were flagged by the platform in the days following the election, as he claimed, without evidence, that he had won and that the process had been tainted by massive fraud.