For me it is way better to "actively discourage 1/3 of our population from being involved in the discussion" than close to 100%.
My government (Swedish) don't give a rats ass about what I think or the rest of the population. It is actively making almost every citizen a criminal with new laws that only serve US corporations, it is actively helping US spy on it's citizen (breaking many laws in the process), it is taking away our rights, our courts are breaking constitutional laws without any reprimands. Our Secretary of State was involved (board member if my memory serve me right) in a company that have done mass murders in Africa in the hunt for oil.
An I know most western governments are going down this road to hell.
And how would they communicate instead? Via a custom build forum that none uses? To get feedback from 2/3 of the population is probably the most ANY government in history have done.
Iceland and Norway are the only two (as far as I know) countries in the west that are not going strait to being a police state. And yes, I have thought of migrating as I don't at all like the express road to hell we are on. In 50 years we will have history classes in school where the students will ask why no one cared or did anything (like what happened in Germany around WW2).
Yeah, I hate Facebook as much (or more) than anybody else, but if the devils tool can be used to stop the trip to hell, I'm all for it.