PALO ALTO, Calif. -- Facebook co-founder and CEO Mark Zuckerberg updated his status to "married" on Saturday.
Zuckerberg and Priscilla Chan tied the knot at a small ceremony at his Palo Alto, Calif., home, capping a busy week for the couple.
Zuckerberg took his company public Friday in one of the most anticipated stock offerings in Wall Street history.
Chan, 27, graduated from medical school at the University of California, San Francisco, on Monday, the same day Zuckerberg turned 28.
The couple met at Harvard and have been together for more than nine years.
A source authorized by the couple to speak for them said Zuckerberg designed the ring featuring "a very simple ruby."
The ceremony took place in Zuckerberg's backyard before fewer than 100 guests, who thought they were there to celebrate Chan's graduation.
His Facebook profile page included a photo of the newlyweds. Even after the IPO, Zuckerberg remains Facebook's single largest shareholder, with 503.6 million shares, and he controls the company with 56 percent of its voting stock.
Facebook closed Friday at $38.23, a gain of 23 cents, or 0.61 percent.
That makes Zuckerberg's shares worth $19,252,698,725.
About 570 million shares were traded on its first day as a public company. For perspective, that is roughly equal to the combined trading volume of 28 of the 30 stocks in the Dow Jones industrial average -- every Dow stock except Bank of America and JPMorgan Chase.
The social networking site, which was born in a Harvard dorm room eight years ago, has grown into a worldwide network of almost a billion people.
Zuckerberg founded Facebook at Harvard in 2004. He was named as Time's Person of the Year in 2010, at age 26.