Bluesky chief doesn't know age limit for platform

Bluesky was developed by Twitter co-founder Jack Dorsey, and visually looks how X used to look back in its Twitter days.

Mr Dorsey is no longer part of the team behind it, having stepped down from the board in May last year, and the platform has experienced a surge in sign ups since the results of the US election.

Elon Musk, the owner of X, was a major backer of Donald Trump during his campaign.

He will also be heavily involved in the President's administration after being named co-head of the new administration's Department of Government Efficiency.

Political division has lead to some people leaving X in protest since the election, and Bluesky appears to have benefitted.

In September, the company said it had nine million users. This week, it surpassed 20 million.

However that remains far behind X, as well as Threads, a rival platform set up by Meta, the owner of Facebook and Instagram.

Meanwhile, Sir Keir Starmer said this week he has "no plans" to join the social media platform.

The Prime Minister told reporters that "at the moment" there are no moves to establish official UK government accounts or a personal one in his name.

He said it is "important for a government" to be able to communicate with "as many people as possible".

X does not share its total user numbers but it is understood to be measured in the hundreds of millions. Mr Musk himself has 205m followers on his account.