Top 7:
Warren Buffett, Bill Gates, David Rockefeller Jr., Oprah Winfrey, George Soros, Ted Turner, Michael Bloomberg
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well not sure the other top 8, but 1 is Warren Buffett and 2 is Bill Gate through the Bill and Melinda Gate Foundation
note: Buffett donated 90% of his net worth to the foundation payable over 30years or something.