December 2010 - Signs the Giving Pledge, a public pledge to give away the majority of his wealth to philanthropic causes.
2010 - Is named Time Person of the Year.
April 2011 - A U.S. appeals court rejects the Winklevoss' attempt to void their earlier settlement with Facebook. The Winklevosses argued that their $65 million settlement wasn't enough because Facebook misrepresented the value of company stock.
May 18, 2012 - Facebook IPO - trading opens at $42.05 and closes at $38.23.
May 23, 2012 - Three Facebook shareholders file a lawsuit in federal court against Zuckerberg, underwriter Morgan Stanley and others alleging they withheld crucial financial information about Facebook before the IPO.
October 4, 2012 - Announces that Facebook has passed one billion active monthly users.
December 2012 - Announces, on his Facebook page, that he has donated 18 million Facebook shares to the Silicon Valley Community Foundation.
March 2013 - Forbes lists Zuckerberg's net worth as$13.3 billion.