It was 15 years ago that Ted Turner needed something interesting to say in a speech — and decided, in a rush, to give away $1 billion. (..) So, in front of a stunned dinner audience, he announced a $1 billion gift to United Nations causes such as fighting global poverty. (..) Turner’s gift helped change that culture, reviving the tradition of great philanthropists like Rockefeller and Carnegie. Turner publicly began needling other billionaires — including Bill Gates and Warren Buffett — to be more generous. That was a breach of etiquette, but it worked.