Even moguls make mistakes on social media.

Billionaire innovator Elon Musk apparently accidentally shared his cell phone number on Twitter for the world to see Tuesday.

"Do you have a sec to talk? My cell is ..." the CEO of Tesla and SpaceX wrote in a message directed at a Facebook executive.

Musk quickly deleted the tweet, but it was too late. With nearly 17 million followers, there was no way to take it back.

Numerous people who tried dialing the phone number reported hearing a voicemail message from the video game God of War: "By the Gods you've done it," it said. “Somehow you’ve found your way here to me. I offer you my congratulations and my respect.”

The quirky nature of Musk's voicemail is fitting for an executive who often cracks jokes online, which contrasts sharply with the serious businesses he's pursuing.

His wide-ranging interests include revolutionizing transportation through Tesla and the Boring Company, flying to Mars with SpaceX and fostering brain implant communication with Neuralink.

His tweet drew extra attention because it was apparently meant as a private message for John Carmack, chief technology officer of Facebook's Oculus virtual reality division.

Some observers speculated that Musk was aiming to recruit Carmack. The Facebook exec didn't directly address Musk's tweet but said on Twitter that "I spent over a decade building rockets and founded the Commercial Spaceflight Federation."

Across Twitter, users cracked jokes about Musk's goofup.

Follow USA TODAY reporter Nathan Bomey on Twitter @NathanBomey.