Those with paralysis due to cervical spinal cord injury or amyotrophic lateral sclerosis may qualify for the study, which will take about six years to complete, reports say.

Musk has said X should be a platform for people to post diverse viewpoints, but the company will limit the distribution of certain posts that may violate its policies, calling the approach 'freedom of speech, not reach.'

In Silicon Valley, Netanyahu may try to bolster relations with executives in the high tech sector, a key driver of Israel's economy.

Billionaire Elon Musk, who bought Twitter in October, has previously lashed out at news organisations and journalists who have reported critically on his companies, which include Tesla and SpaceX.

Modi's meeting with Musk came days after Twitter co-founder Jack Dorsey accused India of threatening to shut down the platform for not complying with content takedown orders during a 2020-2021 protest.

Since his arrival in China, the US billionaire has been showered with praise from the Chinese public but Musk himself has been uncharacteristically silent and has yet to make any public statements.

The call feature on Twitter will bring the micro-blogging platform into line with the likes of Meta's social media applications, Facebook and Instagram, which have similar features.

Musk, who acquired Twitter last year for about RM195 billion, said in a memo to staff in November that employees should be prepared to work 'long hours at high intensity' or quit.

China is Tesla's second-largest market after the US and its Shanghai plant is the electric carmaker's largest production hub.

The concerns come as Europol joined a chorus of ethical and legal concerns over advanced AI like ChatGPT, warning about the potential misuse of the system in phishing attempts, disinformation and cybercrime.

Fourteen of the top 30 advertisers on Twitter stopped all advertising on the platform after Musk took charge on Oct 27, reports say.

This is the first time Musk has mentioned stepping down as chief of the social media platform, after Twitter users voted decisively in a poll for him to step down, which the billionaire launched.