Facebook co-founder and CEO Mark Zuckerberg’s net worth tumbled by billions of dollars within hours as his social networks went offline and a whistleblower prepared to testify before Congress.

Here are some memorable moments from Facebook co-founder and CEO Mark Zuckerberg’s life in the public eye.

2004: Mark Zuckerberg and Chris Hughes, creators of "Facebook," photographed at Eliot House at Harvard University, Cambridge, Massachusetts, on May 14, 2004.

2005: Chris Hughes (left) and Mark Zuckerberg, of Facebook, in their Palo Alto, California, location.

2009: Mark Zuckerberg, CEO of Facebook, attends the Digital Life Design (DLD) conference on January 27, 2009, in Munich, Germany.

2010: Facebook founder and CEO Mark Zuckerberg delivers the opening keynote address at the f8 Developer Conference April 21, 2010, in San Francisco, California.

2011: U.S. President Barack Obama talks with Facebook CEO Mark Zuckerberg during a town hall style meeting at Facebook headquarters on April 20, 2011, in Palo Alto, California.

2013: Anna Kendrick and Mark Zuckerberg are presenters at the 2014 Breakthrough Prizes Awarded in Fundamental Physics and Life Sciences Ceremony at NASA Ames Research Center on December 12, 2013, in Mountain View, California.

2014: Breakthrough Prize co-founders Priscilla Chan and Mark Zuckerberg attend. the Breakthrough Prize Awards Ceremony Hosted by Seth MacFarlane at NASA Ames Research Center on November 9, 2014, in Mountain View, California.

2015: Facebook CEO Mark Zuckerberg and Dr. Priscilla Chan arrive for a state dinner in honor of Chinese President President Xi Jinping and his wife Peng Liyuan at the White House on September 25, 2015, in Washington, D.C.

2016: Pope Francis meets Facebook founder and CEO Mark Zuckerberg, second from left, and his wife Priscilla Chan, at the Santa Marta residence, the guest house in Vatican City where the pope lives, Monday, Aug. 29, 2016.

2017: Facebook founder and CEO Mark Zuckerberg delivers the commencement address at the Alumni Exercises at Harvard’s 366th commencement exercises on May 25, 2017, in Cambridge, Massachusetts.

2018: Facebook co-founder, Chairman and CEO Mark Zuckerberg testifies before a combined Senate Judiciary and Commerce committee hearing in the Hart Senate Office Building on Capitol Hill April 10, 2018, in Washington, D.C.

2019: Priscilla Chan and Mark Zuckerberg attend the eighth annual Breakthrough Prize Ceremony at NASA Ames Research Center on November 3, 2019, in Mountain View, California.

2021: CEO of Facebook Mark Zuckerberg walks with COO of Facebook Sheryl Sandberg after a session at the Allen & Company Sun Valley Conference on July 8, 2021, in Sun Valley, Idaho.
According to Bloomberg, the 37-year-old social media magnate’s worth fell by at least $6 billion – to $121.6 billion – as Facebook shares plunged 4.9% on Monday. Forbes reported similar figures, saying Zuckerberg’s fortune dropped to $117 billion – a $5.9 billion decline. The new numbers put him at No. 5 on Bloomberg’s list of the world’s richest people, behind Elon Musk, Jeff Bezos, Bernard Arnault and Bill Gates.
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Former Facebook employee Frances Haugen speaks during a hearing of the Senate Commerce, Science, and Transportation Subcommittee on Consumer Protection, Product Safety, and Data Security, on Capitol Hill, Tuesday, Oct. 5, 2021, in Washington.

Sen. Roger Wicker, R-Miss., Sen. Marsha Blackburn, R-Tenn., Sen. Jerry Moran, R-Kan., and Sen. Richard Blumenthal, D-Conn., arrive for a Senate Committee on Commerce, Science, and Transportation hearing on Capitol Hill on Tuesday, Oct. 5, 2021, in Washington.

Former Facebook employee and whistleblower Frances Haugen arrives to testify before a Senate Committee on Commerce, Science, and Transportation hearing on Capitol Hill on Tuesday, Oct. 5, 2021, in Washington.

Sen. Maria Cantwell, D-Wash., talks with Sen. Ed Markey, D-Mass. as former Facebook data scientist Frances Haugen speaks during a hearing of the Senate Commerce, Science, and Transportation Subcommittee on Consumer Protection, Product Safety, and Data Security, on Capitol Hill, Tuesday, Oct. 5, 2021, in Washington.

Former Facebook employee and whistleblower Frances Haugen listens to opening statements during a Senate Committee on Commerce, Science, and Transportation hearing on Capitol Hill on Tuesday, Oct. 5, 2021, in Washington.

Former Facebook employee and whistleblower Frances Haugen arrives to testify during a Senate Committee on Commerce, Science, and Transportation hearing on Capitol Hill on Tuesday, Oct. 5, 2021, in Washington.

Sen. Marsha Blackburn, R-Tenn., left, and Sen. Richard Blumenthal, D-Conn., right speak to former Facebook data scientist Frances Haugen, center, during a hearing of the Senate Commerce, Science, and Transportation Subcommittee on Consumer Protection, Product Safety, and Data Security, on Capitol Hill, Tuesday, Oct. 5, 2021, in Washington.

Former Facebook employee and whistleblower Frances Haugen testifies during a Senate Committee on Commerce, Science, and Transportation hearing on Capitol Hill on Tuesday, Oct. 5, 2021, in Washington.

Sen. Roger Wicker, R-Miss., and ranking member Sen. Marsha Blackburn, R-Tenn., talk before a Senate Committee on Commerce, Science, and Transportation hearing on Capitol Hill on Tuesday, Oct. 5, 2021, in Washington.

Former Facebook data scientist Frances Haugen speaks during a hearing of the Senate Commerce, Science, and Transportation Subcommittee on Consumer Protection, Product Safety, and Data Security, on Capitol Hill, Tuesday, Oct. 5, 2021, in Washington.
The news came as Facebook, Instagram and WhatsApp suffered a worldwide outage that began shortly before noon Monday, according to The Associated Press. The services began to come back online about six hours later.
>> Facebook, Instagram, WhatsApp services being restored slowly, company confirms
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“We want to make clear at this time we believe the root cause of this outage was a faulty configuration change,” the company said in a blog post Monday night. “We also have no evidence that user data was compromised as a result of this downtime.”
Meanwhile, whistleblower Frances Haugen, who worked as a product manager for Facebook, was slated to testify before a U.S. Senate subcommittee Tuesday, according to the AP.
“Facebook, over and over again, has shown it chooses profit over safety,” she said in a “60 Minutes” interview Sunday, adding that she doesn’t trust that the company is “willing to actually invest what needs to be invested to keep Facebook from being dangerous.”
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– The Associated Press contributed to this report.