Mark Zuckerberg has joined the world's most exclusive club of the ultra rich.

The Facebook CEO on Thursday became a centibillionaire: someone who is worth at least US$100 billion. He crossed the milestone after shares in the social network surged. Only two other men, Amazon's Jeff Bezos and Microsoft's Bill Gates, have bigger personal fortunes.

Zuckerberg co-founded Facebook in 2004, and his biggest asset is still his 13% stake in the company, according to the , which tracks the world's wealthiest people.

The 36-year-old is also Facebook's chairman and controlling shareholder.

Zuckerberg's wealth got its latest bump as Facebook's stock climbed 6.5% Thursday, a day after the company launched its on Instagram. The release of the short video feature came just as US President Donald Trump threatened to ban TikTok, the Chinese-owned app that has exploded in popularity over the last year.

Trump made good on that threat Thursday, that would block TikTok from operating in the United States if its Chinese owner, ByteDance, doesn't sell the business to a US firm within 45 days.

ByteDance has been in negotiations about a potential sale, though the chief of the Chinese company has about the White House's forceful approach.

TikTok has also recently taken direct aim at Facebook, with CEO Kevin Mayer slamming Reels as "another copycat product."

"To those who wish to launch competitive products, we say bring it on," he in a last week.

The introduction of Reels also came a week after Facebook . Last Thursday, the company said it had reached a new record of 3 billion users across its platforms, including WhatsApp and Instagram.

The company also noted that it had benefited as more people around the world stayed home because of the pandemic, pushing up its engagement numbers over the quarter that ended in June.

Facebook shares are up almost 30% so far this year, adding to Zuckerberg's wealth.

In 2010, the chief executive the Giving Pledge, an initiative started by Warren Buffett and Bill and Melinda Gates to encourage the world's richest to donate the bulk of their fortunes to charity.

And in 2015, Zuckerberg went a step further, he would give away what he makes from 99% of his Facebook stake.