Mark Zuckerberg was 23 and clueless about money. She was 38 and about to make him one of the richest humans alive.

Everyone told her she was insane to leave.

Sheryl Sandberg was 38 years old. A Vice President at Google. One of the most powerful women in Silicon Valley.

And she was about to throw it all away for a company that had no idea how to make money.

"Stay at Google. You're set for life."
"Facebook is a college website. It will never last."
"Why take the risk? You've already made it."
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