I might sound like I'm being a bit hyperbolic, but I find it deeply scary that Facebook is applying its considerable engineering talent towards building censorship and monitoring at scale. Facebook has some of the smartest engineers in the industry as well computing power that only the richest governments can match, and they have a good shot at cracking the problem of doing efficient censorship at scale. China manages to scale its censorship by employing more and more people to censor. If Facebook builds a plug-in system that allows governments to censor automatically, then every country could censor like China, at a fraction of the cost.
By implementing censorship FB will make such option even less likely to happen in future.