In 2010, Hammer's breakthrough film role was in David Fincher's The Social Network, about the creation of Facebook. He portrayed the identical twins Cameron and Tyler Winklevoss, with actor Josh Pence serving as a body double during filming. The filmmakers utilized computer-generated imagery during post-production to superimpose Hammer's face over Pence's as well as the use of split-screen photography in certain scenes. In preparation for the film, Hammer stated that he had to learn how to row on both sides of a boat in order to play the twins, who are rowing champions. Hammer and Pence also went through 10 months of extensive twin boot camp in preparation for their roles, in order to, "drill the subtle movements and speech patterns that the Winklevosses would have developed over two decades of genetic equality. " This film earned Hammer his first critical plaudits, with Richard Corliss of Time remarking that Hammer's portrayal of the twins was, "an astonishingly subtle trompe l'oeil of special effects. " For his role in the film, Hammer won Toronto Film Critics Association Awards for Best Supporting Actor.