New York Times review

What makes Mark Zuckerberg run? In “The Social Network,” David Fincher’s fleet, weirdly funny, exhilarating, alarming and fictionalized look at the man behind the social-media phenomenon Facebook — 500 million active users, oops, friends, and counting — Mark runs and he runs, sometimes in flip-flops and a hoodie, across Harvard Yard and straight at his first billion. Quick as a rabbit, sly as a fox, he is the geek who would be king or just Bill Gates. He’s also the smartest guy in the room, and don’t you forget it. The first time you see Mark (Jesse Eisenberg, firing on all cylinders) he’s 19 and wearing a hoodie stamped with the word Gap, as in the clothing giant but, you know, also not. Eyes darting, he is yammering at his girlfriend, Erica (Rooney Mara), whose backhand has grown weary. As they swat the screenwriter Aaron Sorkin’s words at each other, the two partners quickly shift from offline friends to foes, a foreshadowing of the emotional storms to come. Soon Mark is back in his dorm, pounding on his keyboard and inadvertently sowing the seeds of Facebook, first by blogging about Erica and then by taking his anger out on the rest of Harvard’s women, whose photos he downloads for cruel public sport: is she hot or not. — Manohla Dargis