“Twitter deal temporarily on hold pending details supporting calculation that spam/fake accounts do indeed represent less than 5% of users,” he wrote on Twitter.

Musk, the world’s richest man and founder of automaker Tesla, had made the eradication of spam accounts and bots one of the centrepieces of his proposed $44 billion takeover of Twitter.

When the deal was announced in late April he said he wanted to make Twitter “better than ever” by “defeating the spam bots and authenticating all humans”.

But his potential stewardship of the social media platform has hit several bumps since then.

On Wednesday, Musk said he would be open to lifting a ban on former president Donald Trump imposed after the attack on the US Capitol on January 6, 2021.

Activist groups had called on advertisers to boycott the platform if Musk opened the the gates to abusive and misinformative posts.

Friday’s announcement saw shares drop by 20 percent in early electronic trading before Wall Street opened.