Elon Musk Just Shared His Phone Number on Twitter The blunder happened after the tech mogul accidentally tweeted at Oculus CTO John Carmack instead of sending him a private message. “Do you have a sec to talk? My cell is…” Elon Musk tweeted Musk reached out to Carmack to discuss Facebook's virtual reality project. The tweet was briefly seen by Carmack's 16.7 million followers!