The gift announced yesterday will cover part of the USD 29 million cost for adding another facility to the Ravenswood Family Health Centre in East Palo Alto, Calif.
The new building is expected to be complete next year. The 29-year-old Zuckerberg has become one of the world's richest people since he started Facebook's online social network at Harvard University nearly a decade ago. Forbes magazine estimates his wealth at USD 19 billion.
Mark Zuckerberg has been funneling some of his fortune into philanthropy. Last year, he and his wife, Priscilla Chan, donated Facebook stock valued at USD 900 million to the Silicon Valley Community Foundation.