Rocket company SpaceX's verified Facebook page disappeared on Friday, minutes after its founder and Silicon Valley billionaire Elon Musk promised on Twitter to take down the page when challenged by a user. "Delete SpaceX page on Facebook if you're the man?" a user tweeted to Tesla Inc chief Musk. His response: "I didn\u2019t realize there was one. Will do." () SpaceX's Facebook page, which had more than 2.7 million followers, is no longer accessible. () I didn\u2019t realize there was one. Will do. \u2014 Elon Musk (@elonmusk) March 23, 2018 What\u2019s Facebook? \u2014 Elon Musk (@elonmusk) March 23, 2018 yasssssssss pic.twitter.com\/qMdTrkcQQm \u2014 Ryan Mac (@RMac18) March 23, 2018 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.