The verified Facebook pages of Tesla and SpaceX companies have been closed shortly after CEO Elon Musk promised to do so, after being challenged by a user on Twitter.

"Delete SpaceX page on Facebook if you're the man?" a user tweeted to Tesla Inc chief Musk. His response: "I didn't realize there was one. Will do."

Delete SpaceX page on Facebook if you're the man?

— ㅤ (@serdarsprofile) March 23, 2018

SpaceX's Facebook page, which had more than 2.7 million followers, is no longer accessible, while the company's Facebook-owned Instagram profile is still accessible.

Musk had begun the exchange by responding to a tweet from WhatsApp co-founder Brian Acton of the #deletefacebook tag.

"What's Facebook?" Musk tweeted.

Musk's distaste for Facebook may date back to 2016 controversy, in which Facebook founder Mark Zuckerberg blamed Musk's SpaceX for a failed launch which destroyed its satellite.