the things impossible without Facebook :)
The main thing that Facebbok does isn't [technically] enabling some specific communications in some specific space, the main thing is that Facebook puts people into that space, bumps them one into another and thus forcing/making/nudging/tempting to perform act of communication that otherwise may not have happened. Facebook makes [helps to unleash] one a social beast.
Vs. the force in dystopias, in the Facebook case we have dopamine generating activities grounded in the Facebook environment. While they can be replaced by dopamine generating activities in other environments [ i enjoy mine here on HN for example ], why would a social dopamine addicted beast that gets it fix on-schedule bother?
Mostly it's just a website.
I'd rather save criticism of this fabulously wealthy conglomerate to be directed at the disturbing ways they are trying to claim ownership of things outside their Matrix, such as that of my personal identity, and to track my comings and goings outside their Matrix without my consent. Those parts are disturbing and dangerous, especially when coupled with their deep interest in mixing it up in politics and influencing laws to create a captive universal audience.
Matrix is fine, but I want it to stay bottled up and optional.
Depending on how much time you spend on the site, they probably also have profiled a sizable portion of your thoughts simply by tracking clicks and pageviews.