The weakest part of the whole film was at the end when it shows Zuckerberg alone, pitiful, refreshing his facebook page hoping his long lost ex would be his "friend" on facebook. I'm one of those people who feels insulted when filmmakers pull overt, lazy stunts like that.
Sorkin hates the idea of facebook. He thinks the whole idea of a social network is a lie and he may be right. He thinks people who use facebook are wasting their time. I saw that on Colbert I think.
I applaud Sorkin's candor. Not too many people say what they think these days, but I felt like he was insulting the audience with that last scene, saying, essentially, "You people do this too, and you're pitiful." He didn't have to show us what was on Zuckerberg's screen. Most people could have guessed what he was doing without seeing the screen. Sorkin decided to show the screen so people would have no doubts about what was happening. I'm reasonably certain Zuckerberg was not actually doing that during his deposition.