> When FB moderators can impose penalties outside the context of Facebook, like jailing people.
...or seeding the Internet outrage machine by manufacturing a digital lynch mob to harass the person, dox them, harass their employer and friends and family, and utterly destroy their lives? I mean, this happens on Twitter and Tumblr all the time just by itself; actually controlling the platform would make it so much easier!
When FB moderators can impose penalties outside the context of Facebook, like jailing people.
Other than that, Facebook's control of content on its own site may be a good or bad decision, but it's nothing like police power of any kind, “Thought Police" or otherwise.
> When will be the first time a person is (if not having happened already) killed for their postings to FB?
It has probably happened already, but not because of Facebook exerting moderation.