Facebook lost a director to Warren Buffett's Berkshire Hathaway in March. Here are the social network's 9 board members.

Facebook CEO Mark Zuckerberg and COO Sheryl SandbergCourtesy of Facebook

• Facebook's board lost former American Express CEO Kenneth Chenault to Warren Buffett's Berkshire Hathaway in March.
• Chenault said it was a "once-in-a-lifetime opportunity" to work with Buffett and Berkshire's other bosses.
• Facebook has lost other directors in the past 18 months including the head of Netflix, the ex-CEO of the Bill and Melinda Gates Foundation, and a former White House chief of staff.
• The board, however, still boasts Mark Zuckerberg, Sheryl Sandberg, Peter Thiel, and Marc Andreessen.
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Facebook's board lost Kenneth Chenault, the head of General Catalyst and former American Express CEO, to Warren Buffett's Berkshire Hathaway earlier this year.

"I am stepping down from the board because I have a once-in-a-lifetime opportunity to work more closely with my friend Warren Buffett, the Berkshire Hathaway board and the management team," Chenault said in a March 13 statement.

The social network has replaced several other directors in the past 18 months: Netflix CEO Reed Hastings; Dr. Susan Desmond-Hellmann, former CEO of the Bill and Melinda Gates Foundation; Erskine Bowles, who served as White House chief of staff under President Bill Clinton; and Jeffrey Zients, CEO of Cranemere and an economic adviser to Barack Obama during his presidency.

Facebook's board still boasts CEO Mark Zuckerberg, operating chief Sheryl Sandberg, billionaire investor Peter Thiel, and venture capitalist Marc Andreessen.

Here are its nine directors: