The alternatives, where we have gatekeepers like Google and Facebook entirely deciding what is permissible speech, is too far to the other extreme.
Which is precisely the opposite of what these major corporate speech platforms are doing by creating filter bubbles and deplatforming wrong thinkers.
It's the same as sending small time/non violent criminals to prison to incubate with hardened violent criminals.
"We merely bring to the surface the hidden tension that is already alive. We bring it out in the open, where it can be seen and dealt with. Like a boil that can never be cured so long as it is covered up but must be opened with all its ugliness to the natural medicines of air and light, injustice must be exposed, with all the tension its exposure creates, to the light of human conscience and the air of national opinion before it can be cured."
But to go with your interpretation: If you ask the victims of the Arab spring, fb is no better than 8chan. Also YouTube did a bad job in containing Islamic state propaganda early on .