A new book reveals Facebook, Amazon and Google's business secrets. Here's a breakdown of the key lessons from 'Always Day One'.

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Mark Zuckerberg, Sundar Pichai, and Jeff Bezos.

• A new book by BuzzFeed journalist and author Alex Kantrowitz gives readers a sneak peek into the business practices that keep tech giants like Facebook and Google on top.
• "Always Day One" digs deep into Amazon's culture of invention, Mark Zuckerberg's obsession with feedback, and how important collaboration is to Google.
• The book includes insider gossip about Google employees mocking Marissa Mayer, who left the search giant to become CEO of Yahoo, and how Mark Zuckerberg once matched with his wife's friend on a dating app.
• "Always Day One: How the Tech Titans Stay on Top" by Alex Kantrowitz is on sale now.
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In 2017, CEO Jeff Bezos asked an all-hands Amazon staff meeting: "What does Day Two look like?"

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After a short pause, the billionaire answered his own question: "Stasis, followed by irrelevance, followed by excruciating, painful decline, followed by death."

Bezos' question forms the basis of the new book from BuzzFeed reporter Alex Kantrowitz, "Always Day One: How the Tech Titans Stay on Top".

Written over several years, the book offers exclusive access to a host of previously unrevealed insider tidbits, including everything from Google employees mocking outgoing exec Marissa Mayer to Mark Zuckerberg matching his wife's friend on a dating app.

But beyond industry gossip, "Always Day One" gives readers an unparalleled overview of the business secrets, corporate structures, and employee cultures that make the likes of Facebook, Amazon, and Google so successful.

We broke down some of the key lessons from "Always Day One":