> I'm curious about how this is happening in America, of all places.Freedom of speech doesn't mean that any private entity has to facilitate it. In the US it means that the government can't instate laws that limit free speech, for what may be a broader definition of what is considered legitimate expressions thereof than you'd find in a typical European country applying the same principles.
> This strikes me as an odd paradox, coming from a country where people get taught from primary school onward to "disagree with what you say but fight for your right to say it".
Let's say that you throw a party. You invite friends and acquaintances to use your property. After a few hours, everyone is drunk and someone you don't really know well starts shouting racial slurs. You feel uncomfortable about it. Your guests feel uncomfortable about it. Would you fight for his right to use your property as a platform for his ramblings? He's ruining the party and your own reputation as a host is at stake. Your moral standards are being questioned. You would not be limiting his right to say anything by throwing him out. If nothing else he can go home and shout at a mirror.
That's the kind of situation you have with Facebook/Twitter/Google. They invite people to use their property, on their terms. If they don't like you, they'll kick you out. Even if they don't care, they might kick you out to save face. It's not paradoxical; it's very much in line with American culture: everyone should have the right to choose how to represent themselves and how to use their property. Get off my land! Trespassers will be shot!
> I wonder where all this is going to lead, especially since these few companies control so much of global information flow.
Here I think you pinpoint the problem exactly. This problem doesn't only concern censorship but how these companies treat and disseminate information overall. If public debate is largely controlled by private, poorly unregulated organizations, democracy takes a hit. Maybe tighter regulation of entities that deal with so much communication is called for. I think GDPR is a step in the right direction. Destroy the economic incentives to facilitate so much communication.