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"Dating you is like dating a stairmaster," Erica Albright (Rooney Mara) says, exasperated, in the opening sequence of THE SOCIAL NETWORK. Her personal stairmaster is Harvard student Mark Zuckerberg (Jesse Eisenberg) and you're witness to a car wreck of a break-up in progress. It's emotionally gorey but there will be rubbernecking; you can't look away. If the hilarious stairmaster line doesn't