In a special Thanksgiving edition of "This Week," some of the world's richest people sat down with Christiane Amanpour to talk about their extraordinary Giving Pledge -- a commitment to give the majority of their wealth away through philanthropy. Warren Buffett, Bill and Melinda Gates, Ted Turner and others delved into the meaning of philanthropy, their moral obligation to give back and the future of the country in which each of them reached the heights of prosperity.
