Or maybe in fact something completely opposite is the case: relations between teenagers’ social circles are so difficult to map (there is so plenty of inclusions, exclusion, intersections and other Boolean staff) that Facebook is not able to manage it ;-)
I case of such companies like Facebook there is no point to say that they are dead. In fact there are 2 Facebooks: Facebook as a company and FACEBOOK as a presence in modern culture. The second is much more important, then the first one. For many people FACEBOOK is the way they act on the web and communicate with others. Even if Facebook is not growing any more (or even shrinking) it still the only medium that has a digital picture of relations between 1 billion people and that makes is something more then just a company. Of course if I were 16 now, I would not be on Facebook, because in this age you have a lot of things that you wish to keep in secret. But still Facebook is one of first app we install on a new mobile device.
I do not see any comparison between Fb and Microsoft or Fb and Apple. Facebook do not produce any goods etc. It just mapping relations and other features of people into digital data.
Of course I am not an economist at all, but still I see here some paradox. Minimal wedges are paid for the jobs that require low qualifications or in fact no qualifications. So for example if we raise 4$ per hour to 5$ for such jobs, we may reduce the value of 1 dollar. If 1 hour of such job was worth 4$ and now is worth 5$, then now 1$ has less value than it used to have. As a consequence the whole economy may experience inflation. I do not believe in simple solutions to complicated problems. Printing more money do not reduce poverty and rising minimal wedges is for me a little bit like printing money.