Patricia Rooney Mara (born April 17, 1985) is an American actress. She has acted in movies, including "A Nightmare on Elm Street" (the remake of the 1984 horror movie) and "The Social Network". Mara played Lisbeth Salander, the title character for the 2011 remake movie "The Girl with the Dragon Tattoo". She was nominated for an Academy Award for her performance. In 2013, she starred in the movie "Side Effects".