Elon Musk tells Twitter staff to work long hours or leave the company 😳

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In his email to staff, Mr Musk said that Twitter "will need to be extremely hardcore" in order to succeed.

"This will mean working long hours at high intensity. Only exceptional performance will constitute a passing grade," he said.

Workers were told that they needed to click on a link by 17:00 EST on Thursday, if they want to be "part of the new Twitter".

He added: "Whatever decision you make, thank you for your efforts to make Twitter successful."

The world's richest man has already announced half of Twitter's staff are being let go, after he bought the company in a $44bn deal.