Jesse Eisenberg joked during his SNL monologue
that he plays Mark Zuckerberg by speaking "in short clipped sentences" and keeping his head very still, but Professor (and must-read film blogger) David Bordwell digs deeper by exploring the eyes, eyebrows and facial behavior
in Fincher's 'The Social Network.'
Crucial to this moment is that nothing but Mark's eyes and lids move; he doesn't even turn his head. At the film's climax, he will open up a little bit, and the eyelids play a central part. Getting the news that the Facebook party has been busted, Mark starts to breathe more laboriously, then wobbles his head slightly and closes his eyes. For once his concentration is broken.