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Twitter
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Donald Trump Jr has 5.3 million followers
Twitter has banned the US president's eldest son from tweeting for 12 hours.
The punishment followed a post by Donald Trump Jr containing a video discussing the benefits of hydroxychloroquine.
Some, including President Trump, have suggested the drug works as a preventative measure against coronavirus, despite medical studies that indicate the contrary.
Twitter said the post had violated its Covid-19 misinformation rules.
Donald Trump Jr will still be able to browse Twitter and send direct messages in the interim.
Twitter told the BBC: "We are taking action in line with our policy."
The main US social media sites have all taken measures to crack down on misinformation about the coronavirus.
