Facebook's Mark Zuckerberg and Priscilla Chan at their wedding, May 19, 2012.
This photo provided by Facebook shows Facebook founder and CEO Mark Zuckerberg and Priscilla Chan at their wedding ceremony in Palo Alto, Calif., Saturday, May 19, 2012. Photo by AP
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Facebook CEO Mark Zuckerberg and his wife are responsible for the largest on-record charitable donation in the United States in 2013.

For the second straight year, Zuckerberg and his wife, Priscilla Chan, gave away 18 million Facebook shares - a gift worth more than $970 million - to the Silicon Valley Community Foundation in December, the Chronicle of Philanthropy reported December 1 in its annual roundup of biggest donors.

The donation was the largest charitable gift on public record in 2013, and marked the first time that donors under the age of 30 were responsible for the year’s largest donation.

Zuckerberg and Chan’s 2013 donation was equal in shares to the gift the couple gave the same foundation in December 2012. That gift was valued at just under $500 million at the time, but the success of Facebook’s stock over the past 12 months more than doubled the value of the 2013 donation, the news website Mashable reported.

The Silicon Valley Community Foundation serves as a gatekeeper to a number of charitable causes. In 2013, the foundation awarded more than 10,000 grants to over 29 different countries, according to its website.

Nike Chairman Phil Knight and his wife Penelope were responsible for the second-largest donation on public record in 2013: a $500 million pledge to the Oregon Health & Science University Foundation for cancer research.

Former New York mayor and media magnate Michael Bloomberg was third on the list, pledging $350 million to Johns Hopkins University; real estate developer Stephen Ross was fifth, pledging $200 million to the University of Michigan; real estate heiress Muriel Block was sixth, bequesting $160 million to the Albert Einstein College of Medicine at Yeshiva University; Irwin Jacobs, the co-founder of communications giant Qualcomm was with his wife eighth, pledging $133 million to Cornell NYC Tech; and among those tied for tenth with $100 million pledges were investor Ronald Perelman (Columbia Business School), financier Stephen Schwarzman (Tsinghua University); real estate heiress Deborah Joy Simon (Mercersburg Academy).