Ooooooooh, that would be a better casting choice. I love Fight Club but in terms of directorial work Social Network might be his magnum opus for right now. For its time Fight Club was, and still is, an incredible piece of work but much of it can be owed to Edward Norton/Brad Pitt's performances, Dust Brothers score, and the amazing sound/visual editing style. People almost knew what to expect, not with the story of course, but with the style of the film even with Fincher on board directing it. Social Network was a nice surprise from Fincher, he was able to push fucking Jesse Eisenberg and Andrew Garfield into pretty great dramatic roles.