Yep, I thought it was a good balanced documentary covering the up and down sides of Facebook. The one really interesting thing I took away was thatstudied psychology as well as a computer science. I didn't realise this but it makes perfect sense as digital social networks thrive on some pretty clever social engineering such as the fact that we are hard wired for social comparison. You don't post an update to Facebook, you "update [your] status."
Agreed, that jumped out at me too. And since the movie seems to be front and centre every time Zuckerberg is mentioned, it's worth noting that they didn't cover his psych studies in the film (that I remember). He's shown jumping on psychological ideas, like when he realises how crucial it is for his project's success that people be able to specify relationship status. But I'm fairly sure I've not seen it mentioned often.