A generous Bitcoin tycoon's way of giving back is by donating through charities.
Laurene Powell Jobs more than just the widow of the late Apple co-founder, Steve Jobs.
Melinda Gates founded the Bill and Melinda Gates Foundation which aims to eradicate world poverty and health problems.
Paul Allen, Microsoft co-founder, is venturing into shipwrecks and sea excavation.
Jeff Bezos is one of the wealthiest men in America, who also involves himself in various charities.