Patricia Rooney Mara (born April 17, 1985) is an American film and television actress. Mara made her acting debut in 2005 and has gone on to star in films including A Nightmare on Elm Street, the remake of the 1984 horror film, and The Social Network. Mara also portrayed Lisbeth Salander, the title character in The Girl with the Dragon Tattoo, a Sony Pictures film based on Stieg Larsson’s Millennium book series.