Facebook CEO Mark Zuckerberg is very self-conscious about his public appearance, according to a forthcoming book.

The book, Facebook: the Inside Story by Wired's Steven Levy, claims Zuckerberg gets his armpits blow-dried before making appearances at major public events.

A Facebook spokesperson cast doubt on the book's claim but did not outright deny it.

"I doubt this is true and if so it would have been at our communications team's request," the spokesperson told Business Insider. "But surely anyone who has ever worn a grey t-shirt can relate."

Zuckerberg made headlines in 2010 when he was visibly sweaty during an onstage interview at a conference and removed his hoodie.

Twitter CEO Jack Dorsey made light of the armpit report.

"I’d be happy to provide that service for anyone on our comms team if needed," Dorsey joked Tuesday.

