Does the film take a stance for or against the existence of Facebook? Does it comment in any way on the impact it has had on the world today?

yes its for facebook due to Zuckerberg is going following this one girl and she is about to be in a breakup and he's trying to go and get her basically  kinda in some ways due to some people do follow there ex's on facebook or some other social media site and others could be in a relationship and going to find other people so yes and no 

3. Is there anything stereotypical about the representation of adults? 

I think its for somewhat older people maybe 18-25 years old today due to how the words are worded and how it shows facebook and social medias. social media is were most people find news and stories on to what is going on in there everyday life. and news on facebooks also spreads every fast and that is on mostly every social media page out there.