The young couple donated 18 million shares of Facebook stock, valued at more than $970 million, to a Silicon Valley non-profit in Dec 2013.
A report published by The Chronicle of Philanthropy claimed that Zuckerberg's donation was the largest charitable gift on the public record in 2013. Hence, the couple has been named on the top of the magazine's annual list of 50 most generous Americans in 2013.
Zuckerberg and wife have been named at top of list of philanthropists in America
According to the report, at least $7.7 billion, plus pledges of $2.9 billion was donated by the top 50 contributors of the country.
The Chronicle's editor said that the most significant fact from the list was the amount of money coming from living donors, which totalled about the same amount as the two previous years combined.
Stacy Palmer, Chronicle editor, was quoted as saying, "It's a sure sign that the economy is getting better and people are getting a lot less cautious.".