To the delight of many of his Twitter followers, Tesla and SpaceX chief executive Elon Musk on Friday followed through on a promise to delete the Facebook pages of both companies, flushing more than 5 million combined "likes" down the digital drain on a whim.

The Facebook pages for the automaker and aerospace innovator have been replaced by a default page noting that "content isn't available right now."

"I didn't realise we had a Facebook page": Elon Musk

Musk apparently decided to take down the pages while responding to posts on Twitter, including one from Brian Acton, the co-founder of the Facebook-owned WhatsApp. Acton's tweet included the hashtag #deletefacebook.