Shortly after launching the Giving Pledge, Gates and Buffett held group dinners with moguls in countries like China, India and Saudi Arabia, and faced cultural hurdles that ranged from civic modesty to perpetuating family dynasties.

FORBES: The Giving Pledge Goes Global -- Warren Buffett Details America's Latest 'Export'

Buffett says that this group of new Pledgers was specifically responsible for advocating the movement in their respective countries, serving both as role models and recruiters, with the goal of creating local ripple effects.

FORBES: The Giving Pledge Goes Global -- Warren Buffett Details America's Latest 'Export'

In a rare group appearance, Warren Buffett, Alan Simpson and Erskine Bowles came together in Sun Valley for a CNBC interview.

FORBES: Bowles: "We Are Going Over The Fiscal Cliff"

In 2010 Steyer and his wife, Kat Taylor, were among the first group to sign the Bill Gates and Warren Buffett Giving Pledge.

FORBES: California Hedge Fund Billionaire Tom Steyer To Step Down, Focus On Philanthropy

Gordon Brown has taken advice from a group of "wise men", such as Warren Buffett and Bill Gates, for several years.

BBC: Business leaders to advise Tories

Drawing on Warren Buffett's observation that it cannot be a coincidence that a group of investors taught by Benjamin Graham can make above average returns, Mr Mallaby presents original research on the performance of a group of fund managers who worked with Julian Robertson at Tiger Management, and similarly reveals superior returns.

ECONOMIST: Learning and learning

That includes burger aficionado Warren Buffett, who according to the UCLA business school website, told a group of visiting students back in 2005 that he hungered to own the chain.

FORBES: In-N-Out Burger Suitors Need to Take Fear Off the Table

Warren Buffett discussed corporate cash in his latest letter to Berkshire Hathaway ( BRK) shareholders, a group that I am part of.

FORBES: Buffett: Don't Be An EPS Worshipper, Look For Penny-Pinchers

After the raffle system was introduced, a group of Fidelity analysts and money managers began plotting ways to get more face-time with Mr. Buffett.

WSJ: Q: What Does It Take to Get to the Oracle?