Randi Zuckerberg
Randi Zuckerberg. Reuters

Media executive Randi Zuckerberg, the sister of Facebook founder Mark Zuckerberg, said she was harassed by a fellow passenger on an Alaska Airlines flight.

In a Facebook revelation, Randi Zuckerberg said the man sitting next to her in First Class repeatedly made "explicit, lewd and highly offensive sexual comments."

Zuckerberg complained to flight attendants about his mischevous behaviour, but they told her not take his comments personally and offered to move her seat, rather than her alleged harasser's.

"He started talking to me about touching himself, kept asking me if I fantasized about the female business colleague I was traveling with, rated and commented on the women's bodies boarding the aircraft as they walked by us, and many more equally horrifying and offensive comments," Zuckerberg wrote in the letter, which she sent to Alaska Airlines executives.

Flight attendants told Zuckerberg the passenger was a frequent flyer with the airline, and while they have had to talk to him about his behavior in the past, she shouldn't take it personally because he "just doesn't have a filter."

A number of sexual harassment allegations have propped up in the last few weeks, with NBC host Matt Lauer being the most significant.

Lauer was fired late Tuesday after an NBC employee detailed what NBC News chief Andrew Lack described as Lauer's "inappropriate sexual behavior" that began at the Sochi Olympics in 2014.

Like Hollywood, Washington and New York City, Silicon Valley is in a moral crisis after a litany of revelations about predatory behavior by powerful men.

Roy Price, the former head of Amazon Studios, resigned in October after a producer accused him of sexual harassment.