Facebook CEO Mark Zuckerberg may be sweating over the upcoming release of a book detailing the company’s history.

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“Facebook: The Inside Story” by Steven Levy of Wired includes an anecdote about a communications executive blow-drying image-conscious Zuckerberg’s sweaty armpits before public appearances, according to a Bloomberg book review.

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Zuckerberg has been known to wear a suit jacket for some public appearances — like being grilled by Congress — but he’s known for his penchant for wearing plain gray T-shirts, even when holding large meetings or making speeches.

Levy’s book is the product of hundreds of interviews and “unprecedented access” to Zuckerberg and COO Sheryl Sandberg, according to the publisher’s blurb.

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Still, a Facebook spokesperson told Business Insider that they “doubt this is true” — the company didn’t immediately reply to FOX Business’ request for comment.

But if it is true, “it would have been at our communication team’s request, but surely anyone who has ever worn a grey t-shirt can relate,” the spokesperson added.

Over at Twitter, CEO Jack Dorsey joked in a tweet that he’s never needed help drying his pit sweat, but he’d “be happy to provide that service for anyone on our comms team if needed.”

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