Facebook founder and CEO Mark Zuckerberg updated his status to 'married' on Saturday afternoon.

He wed his long-time girlfriend Priscilla Chan, 27, in a ceremony at his home in Palo Alto, California.

And the pair announced their marriage in an unsurprising way - by posting a message on Facebook.

The tech mogul took his company public in one of the most anticipated stock offerings in Wall Street history on Friday, which saw the social network valued at $104billion.

Chan also had a busy week, graduating from medical school on Monday, as Zuckerberg marked his 28th birthday.

The guests believed they were going to celebrate Chan's graduation - but to their surprise found they were at a wedding instead.

The wedding ring, a "very simple ruby", was designed by Zuckerberg.

The ceremony took place in Mr Zuckerberg's backyard before fewer than 100 guests, including Facebook's chief operating officer Sheryl Sandberg.

Nine years ago the pair met at Harvard, where Zuckerberg founded Facebook in 2004.

They later moved to California, where Facebook has its headquarters, and Chen studied at the medical school of the University of California, San Francisco.

Facebook's valuation after its flotation on Friday means the social network site is worth about the same as internet shopping giant Amazon, and more than the value of stalwarts such as Disney.