Facebook founder Mark Zuckerberg marries his longtime girlfriend Priscilla Chan

Facebook founder Mark Zuckerberg marries his longtime girlfriend Priscilla Chan on May 19, 2012.

Facebook co-founder and chief executive Mark Zuckerberg married longtime girlfriend Priscilla Chan on Saturday.

The news was announced (where else?) on Facebook, just one day after the company went public.

Zuckerberg, 28, posted a simple wedding photograph, showing the couple against a backdrop of plants and small lights on a string.

Both he and Chan also updated their relationship status to "married."

He ditched his trademark hoodie, appearing in a dark suit and tie, while she wore a sleeveless white wedding dress with lace.

Zuckerberg and Chan met during his sophomore year at Harvard University, where Zuckerberg first nursed Facebook as a dorm-room project.

Chan graduated this year from medical school at the University of California, San Francisco, according to her Facebook page.

The marriage comes just one day after the company, based in California, made its market debut.

Its initial public offering was the biggest opening ever for a tech company and the third-largest IPO in U.S. history, behind only Visa and General Motors.