Trent Reznor and Atticus Ross - The Social Network

Not knowing much about creating electronic music, I am at a loss for how Trent Reznor and Atticus Ross came up with the music for the movie The Social Network.  The ability to express the story around the Facebook phenomenon and all of the drama at its beginning is amazing.

Knowing the movie isn't completely accurate doesn't change the effects of the music.

I am curious about the process Reznor & Ross went through: did they write the music after seeing some of the film?  Did they ever get to see part of the film before composing?

I will hopefully be able to give you an analysis after I see the film, so stay tuned!!