Twitter’s verified users are mostly those who have paid to receive a blue check mark, though Musk has gifted the check mark to some users and others have it as a legacy from the previous regime.

TweetDeck, launched more than a decade ago, shows messages in columns and its search and posting functions operate differently to the website or the app.

The firm, in a support message on Monday, said that it was launching a new version of TweetDeck with various new functions.

“In 30 days, users must be Verified to access TweetDeck,” the message said.

A series of changes to the way Twitter is run left many TweetDeck users unable to see posts on the weekend.

Twitter bought London-based TweetDeck in 2011, with technology media putting the price tag at $40 million at the time.