Bezos reported fortune of $65.3 billion on Thursday against Buffetts' wealth of $64.9 billion, Forbes magazine said
Takes total investment to $5 bn; Murdoch's Star, American Tower Company, Emerson too make big ticket commitments
The company's CEO announced an additional $3 billion investment, taking the total investment up to $5 billion
Bezos said, "With Kay Graham as my role model, I'm very willing to let any of my body parts go through a big, fat wringer, if need be."