It's been almost 15 years since Mark Zuckerberg famously gave a very sweaty interview where he was asked some tough questions onstage. It's a good reminder that Mark Zuckerberg wasn't always the calm and collected CEO known for training with MMA stars and showing off his gym gains on Instagram. Last month, Zuckerberg was pressured to stand up and face the families of children who'd been harmed by social media companies and deliver an apology. But in Facebook's early years, the scene might have sent Zuckerberg into a panic attack — at least, according to a new book. This story is available exclusively to Business Insider subscribers.

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Persons: It's, Mark Zuckerberg, Mark Zuckerberg wasn't, Zuckerberg, who'd Organizations: Instagram, Business