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Keira Knightley

Jason Merritt/Getty Images

Keira Knightley is notoriously private when it comes to her personal life, so it's no surprise she stays off social media.

In the latest issue of Harper's Bazaar U.K., the 28-year-old actress reveals she once secretly joined Twitter under a fake name only to delete her account 12 hours later.

"It made me feel a little bit like being in a school playground and not being popular and standing on the sidelines kind of going, 'Argh,'" Knightley tells the mag.

As for whether or not she thinks being super private adds to the public's opinion of her being a bit snooty, Knightley said, "No, I think that's fine...I like being private. I haven't asked a lot of the actresses who I really admire, 'How do you do it?' because I don't want to know. Maybe I'm childish in that way; I just don't want to know about your life."

Knightley, who married musician hubby James Righton in May, also opened up about feminism in the industry and often being the only female in films dominated by mostly male casts.

"I think it's great that the discussions are finally being allowed to be had [about feminism], as opposed to anybody mentioning feminism and everybody going, 'Oh, f--king shut up,'" she dished. "Somehow, it [feminism] became a dirty word. I thought it was really weird for a long time, and I think it's great that we're coming out of that."