I have a feeling that the truth lies somewhere in the middle. Sean Parker has a lot to gain by dismissing his portrayal as fiction. While Eduardo Saverin has lots of reason to demonize him, I would think it has some grain of truth to it. After all, if Parker is such a swell guy, why is he kicked out of every company he founded?

For the movie, I think Sorkin just created one dimensional people from character nuggets to serve the story he was trying to weave.