While most film studios flock to Facebook in a means to promote their latest project, Sony is not able to advertise their upcoming David Fincher directed biopic The Social Network on the popular social networking site despite the fact that it is based on Facebook and its cofounder CEO Mark Zuckerberg. Some are speculating that the contents of the film are to blame, as the story being told by Fincher doesn't paint the man in a very good light. And the two teaser trailers released only go on to exemplify that notion. Source