Many of you know Rooney Mara as the girl who broke Mark Zuckerberg's heart in The Social Network, but we'll soon be acquainted with her take on the ass-kicking, pierced-up bisexual hacker, Lisbeth Salander, in the highly-anticipated Girl with the Dragon Tattoo.  Here's the low-down on the lucky girl who beat out a countless number of starlets for young Hollywood's most coveted role. [Photo via]