The feud between the two billionaires continues, of Elon Musk and Mark Zuckerberg which now goes to another level. This time the owner of Twitter suggested to Zuckerberg that they have “a literal penis measuring contest”.

In his message, inspired by launch of Threads – this is Meta’s “answer” to Twitter – Elon Musk also included a measuring tape emoji.

He also used a slang word popular in right-wing circles as a term of derision. “Zook is a cuckold,” he pointed out.

By Monday, Threads had reached 100 million users, according to the website Techcrunch, which angered Elon Musk.

Twitter has about 250 million active users but has been plagued by controversy and technical problems since Musk bought it last year for $44 billion.

Launching Threads, Zuckerberg said for his part: “The goal is to keep it friendly as it expands. I think it’s doable and will ultimately be the key to his success.

“That’s one reason why Twitter hasn’t been as successful as I think it should have been, and we want to do it differently,” the billionaire said.