Q: Who is this "that guy"?
In the classroom scene, you see him sitting in the front.

Q: How did two unrelated actors play twins?
The end credits bill Armie Hammer as "Cameron and Tyler Winklevoss" and Josh Pence as "Tyler Winklevoss." Pence's face was digitally scrubbed in post. Fooled me…

Armie Hammer is the great-grandson of oil tycoon Armand Hammer. Rooney Mara, who plays Mark Zuckerberg's ex-girlfriend, is the great-granddaughter of Pittsburgh Steelers owner Art Rooney.

Armie Hammer's previous roles include Harrison Bergeron, "Abercrombie Boy," and evangelist Billy Graham.

Q: Who was the "movie star" at Harvard?

"'Natalie Portman got in touch with me when she heard that I was doing this to say, "Listen…come over for dinner and I'll tell you some stories,'" Sorkin said. [source]

Q: What stories could Natalie Portman have about Mark Zuckerberg?
Maybe Quora knows…

Q: Who bought out this screening?

Earlier this year on his Facebook page, Mark Zuckerberg asked if anyone wanted to see Iron Man 2 at midnight on opening day at this cineplex, but he said in interviews that he would not see The Social Network.

Lo: A Facebook Field Trip To See the Facebook Movie

Zuckerberg reportedly checked in at this cineplex on Facebook Places, but checked in at a nearby taqueria shortly thereafter. Hmm…

Q: IF Mark Zuckerberg saw The Social Network, how would he compare it to a farm animal?

Q: Better visual scene: The tilt-shift regatta in The Social Network or the car wreck one-shot from inside the car in Let Me In?
Yes.