Make no mistake about it: when we first heard that Fight Club, Se7en, and The Curious Case of Benjamin Button director David Fincher was making a movie about Facebook of all things, we scratched our heads. At that time, however, many of us probably had visions of a live-action Tron-esq Facebook world with farm animals and Mafioso running about, upwards thumbs flying through the skies, and everyone poking the ever-loving hell out of each other 24-hours a day.

That of course is not the case at all. Fincher’s movie, called The Social Network, is actually based on the Ben Mizrich book, The Accidental Billionaires: The Founding of Facebook, A Tale of Sex, Money, Genius, and Betrayal. And to add to what’s sure to be a compelling tale, it’s now been officially announced that Trent Reznor, frontman of industrial rock band Nine Inch Nails, will be handling the film’s musical score along with composer Atticus Ross.

Click over to read Reznor’s announcement and to check out the first teaser trailer for The Social Network, if you’ve yet to see it, of course.

The movie will tell the story of the founding of Facebook by Mark Zuckerberg (played by Jesse Eisenberg) and Eduardo Saverin (played by the brand new Spider-Man, Andrew Garfield), and all the behind-the-scenes chaos that ensued. Zuckerberg has nothing to do with the production, but Saverin acted as a consultant on the book for which the movie is adapted.

Here’s what Mr. Reznor had to say about his new gig on the official NIN news feed (via /Film).

I was planning on taking some time off after the continual waves of touring that ended last fall and spend this year experimenting around with what would become How To Destroy Angels and some new NIN. Well, that plan didn’t work out so well. David Fincher started inquiring about my interest in scoring his upcoming film, The Social Network. Yeah, the movie about the founding of Facebook. I’ve always loved David’s work but quite honestly I wondered what would draw him to tell that story. When I actually read the script and realized what he was up to, I said goodbye to that free time I had planned. Atticus Ross and I have been on a creative roll so I asked him if he wanted to work on this with me and we signed on.

Months later, I’m happy to tell you we’re nearing the completion of this and I couldn’t be happier with how it’s turned out. The level of excellence that David operates on is inspiring and the entire process has been challenging and truly enjoyable.

As Atticus and I near the end of the scoring process, we’re looking forward to the next phase – distilling the large amount of music we’ve written for this down to a satisfying record (or two). The film opens Oct 1 in the US with the record likely available a couple of weeks ahead of that.

Speaking of the film… it’s really fucking good. And dark!

Teaser Trailer