Facebook founder and chief executive Mark Zuckerberg updated his status to "married".
Zuckerberg and 27-year-old Priscilla Chan tied the knot at a small ceremony at his Palo Alto, California
And Ms Chan 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.
The ceremony took place in Zuckerberg's backyard before fewer than 100 guests, who all thought they were there to celebrate Ms Chan's graduation.
Zuckerberg founded Facebook at Harvard in 2004 and was named as Time's Person of the Year in 2010, aged 26.