Amazon's Jeff Bezos now the richest man in the world with $90 billion net worth

Bezos founded Amazon in 1994 from his Seattle garage.

Bezos' net worth soared to $90 billion Friday after Amazon's stock went up 12.5 percent, according to data from the Bloomberg Billionaires Index and calculations from CNBC. Amazon's share price was at $1,096 as of Friday afternoon, boosting Bezos' fortune by $7 billion overnight.

Bezos has not yet made the pledge, but he has asked his Twitter followers in the past for ideas on how he should donate some of his money.

Bezos first appeared on Forbes' list of America's 400 richest people in 1998 with a net worth of $1.6 billion, one year after Amazon went public.