Patricia Rooney Mara (born April 17, 1985) is an American actress and philanthropist. She made her screen debut in the slasher film Urban Legends: Bloody Mary (2005) and went on to have a breakout role in the independent coming-of-age drama Tanner Hall (2009), followed by roles in the 2010 remake of A Nightmare on Elm Street and the biographical drama film The Social Network (2010).