Sandberg joins a roster of billionaire women who have become household names for their giving in recent years.
The new enterprise has said it will be in operation by the first quarter of 2022.
But the former hedge fund manager said he believes the rich should pay more in taxes.
Couples are making pricey plans to get hitched as the pandemic wanes, but their friends are fretting over the costs.
Melinda French Gates might not stay at the $50 billion foundation she built with her husband Bill.
The split throws into question the destination of the Bill and Melinda Gates fortune and the focus of their charitable endeavors.
The world's wealthiest may have fortunes growing far faster than their ability to give effectively.
Bill and Melinda Gates's divorce has thrown a spotlight on their money manager and its operation.
Her ex-husband, Jeff Bezos, has also accelerated his giving.
About 3,100 students jumped at an offer to own one-third of a bitcoin seven years ago.
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