Even on Twitter you can make audio and video calls. Elon Musk announced it. "Soon voice and video chats will come from your account to anyone on this platform," he said in a post. "So you can talk to people anywhere in the world without giving them your phone number."

Twitter's messaging feature would, however, compete with a number of free services such as Messenger, Signal, Telegram and WhatsApp. And it is precisely the latter that in another post the owner of Tesla and Space X called "unreliable".

The multibillionaire, who bought the platform last October for $44 billion, also plans to implement the ability to encrypt private messages: "This system will quickly become more sophisticated," Musk said.