Bill Gates and Mark Zuckerberg are not the only prominent philanthropists in Silicon Valley.
Melinda Gates founded the Bill and Melinda Gates Foundation which aims to eradicate world poverty and health problems.
A study revealed the richest people in the US are wealthier than the bottom 64 percent of Americans combined.
Many are predicting that Jeff Bezos' latest sale of Amazon shares will fund his space tourism company Blue Origin.
The net worth of Donald Trump dipped this year due to election spending and dominance of Amazon in retail sales.
Bill Gates wants to eradicate global health issues by making billions of donations to charities.
Jack Ma, Henry Sy, Masayoshi Son, Carlos Slim and Luis Carlos Sarmiento are all self-made millionaires who built their fortune outside America.