Inside the nearly 8-year-long feud between Elon Musk and Mark Zuckerberg that has threatened to become physical

In September 2016, SpaceX was testing its Falcon 9 rocket at a launch site in Cape Canaveral, Florida. Shortly after 9 a.m. the rocket exploded, destroying Facebook's AMOS-6 satellite, which was supposed to ride the rocket into space.

The satellite was part of Facebook's Internet.org project to deliver internet connectivity to the developing world, and it would have been Facebook's first satellite in orbit.

Zuckerberg seemed openly frustrated that the launch failed, writing on Facebook that he was "deeply disappointed to hear that SpaceX's launch failure destroyed our satellite that would have provided connectivity to so many entrepreneurs and everyone else across the continent."

Two years later, Musk addressed the failed launch in a post on Twitter to the reporter Kerry Flynn.

"Yeah, my fault for being an idiot," Musk said. "We did give them a free launch to make up for it, and I think they had some insurance."

During a Facebook Live broadcast, a viewer asked Zuckerberg for his thoughts on Musk's anxieties around AI.

"I have pretty strong opinions on this," Zuckerberg said. "With AI especially, I'm really optimistic, and I think that people who are naysayers and try to drum up these doomsday scenarios ... I don't understand it. It's really negative, and in some ways, I actually think it's pretty irresponsible."

Musk, who has repeatedly called for regulation and caution when it comes to new AI technology, shot back on Twitter.

"I've talked to Mark about this," he said in response to a tweet about Zuckerberg's comments. "His understanding of the subject is limited."

After the WhatsApp cofounder Brian Acton tweeted, "It is time. #deletefacebook," Musk responded, "What's Facebook?"

A fan responded to Musk's tweet asking whether he'd delete the SpaceX Facebook page, to which Musk responded, "I didn't realize there was one. Will do."

After another fan pointed out that Tesla had a Facebook page too, Musk tweeted that it "looks lame anyway."

Soon after, both the SpaceX and Tesla pages disappeared from Facebook. Musk said it wasn't a "political statement" and that he just found Facebook unsettling.

In response to a tweet from the actor Sacha Baron Cohen, which called for more regulation of Facebook, Musk urged people once again to delete the app.

On the evening of the rampage in Washington, Musk tweeted, "This is called the domino effect," along with an image of dominoes, with the first one labeled "a website to rate women on campus," a reference to Facebook's inception at Harvard University. The last domino referenced the rioters.

Musk also criticized Facebook's data-sharing practices, tweeting another meme about Facebook that mentioned the company "spying" on users following the announcement by Facebook-owned WhatsApp that it would start forcing users to share their personal data with the platform.

Musk tweeted that people should "use Signal," an encrypted messaging app. His tweet was retweeted by Twitter CEO Jack Dorsey, another tech executive who has sparred with Zuckerberg.

The Tesla CEO compared Zuckerberg's control of Meta to a monarchy during an interview at the TED conference in Vancouver, British Columbia. (Facebook's parent company changed its name to Meta in October 2021.)

The interviewer, Chris Anderson, asked Musk whether his status as the richest man and one of Twitter's top influencers could pose a conflict of interest if he bought the platform. Musk used the opportunity to take a swipe at his rival.  

"As for media sort of ownership, I mean, you've got Mark Zuckerberg owning Facebook and Instagram and WhatsApp, and with a share ownership structure that will have Mark Zuckerberg the 14th still controlling those entities," Musk said. 

He went on to say that he "won't have that at Twitter."

In December, Meta first brainstormed ideas for a Twitter competitor in order to capitalize on  Musk's chaotic Twitter takeover, according to a report from The New York Times. The company confirmed to Platformer in March that it's working on its own text-based social network, codenamed "Project 92."

Earlier this month, Meta's chief product officer, Chris Cox, appeared to mock Musk and Twitter by saying in an all-hands meeting that it the site will be "a platform that is sanely run."

The billionaire taunted Zuckerberg on X, formerly Twitter, about his rival text-based social media platform.

"I'm sure Earth can't wait to be exclusively under Zuck's thumb with no other options," Musk posted in June.

Later writing: "Zuck my" with a tongue emoji.

On an episode of "The Lex Fridman Podcast," the Meta CEO praised Musk's "push early on to make Twitter a lot leaner."

"I think that those were generally good changes," Zuckerberg said on the podcast.

When the Tesla CEO took over X, he more than halved the company's workforce. Zuckerberg has taken similar cost cutting measures at Meta, initiating a series of layoffs and dubbing 2023 the "year of efficiency."

People who have heard each man's private comments about the feud told The Wall Street Journal in a report published last June that Zuckerberg had long yearned for the public recognition Musk has received over the years as a tech pioneer and that Musk has fretted over Zuckerberg's early success with Facebook.

Last June, Musk said he'd be "up for a cage match" with Zuckerberg. 

The X owner brought up the idea after X users cautioned him to be careful dissing Zuckerberg since he knows jiu-jitsu.

It's unclear whether Musk was joking about the offer to fight the Meta CEO in a cage match. He said via X, "If this is real, I will do it," but later appeared to poke fun at his own fighting skills.

Zuckerberg appears to be taking the idea of a match seriously. After Musk first posted on X that he would be  "up for a cage fight," the Meta CEO posted a screenshot of the post on Instagram with the words "Send me location," and a Meta spokesperson later told The Verge that Zuckerberg is not joking about the offer.

Only time will tell if the two CEOs will duke it out in person.

Some people have already begun placing odds on the fight. Business Insider's Hasan Chowdhury reported that Musk's chances of beating Zuckerberg are slim. 39-year-old Zuckerberg has been trained in MMA fighting and even won some medals at a jiu-jitsu competition in May 2023.

Zuckerberg said in a Threads post in August 2023 that he was "ready to fight since the day Elon challenged" him. 

"If he ever agrees on an actual date, you'll hear it from me," Zuckerberg said in the post. "Until then, please assume anything he says has not been agreed on."

Musk posted on X two days later that "Zuck is a chicken."

"He can't eat at chic fil a because that would be cannibalism," he wrote in a separate post on the same day.

Musk's gift to Zuckerberg for his 40th birthday was a challenge to fight him, once again.

"If only Zuckerberg were as tough (sigh). I've offered to fight him any place, any time, any rules, but all I hear is crickets," Musk said in an X post on May 15.

Musk's post was in response to a satirical news story about a face-off between President Joe Biden and former President Donald Trump.