Far more consequential than overt censorship of individuals is censorship by algorithm. No individual being silenced does as much real-world damage to free expression and free thought as the way ideas and information which aren't authorized by the powerful are being actively hidden from public view, while material which serves the interests of the powerful is the first thing they see in their search results. It ensures that public consciousness remains chained to the establishment narrative matrix. 

It doesn't matter that you have free speech if nobody ever hears you speak. Even in the most overtly totalitarian regimes on earth you can say whatever you want alone in a soundproof room.

That's the biggest loophole the so-called free democracies of the western world have found in their quest to regulate online speech. By allowing these monopolistic megacorporations to become the sources everyone goes to for information (and even actively helping them along that path as in for example Google's research grants from the CIA and NSA), it's possible to tweak algorithms in such a way that dissident information exists online, but nobody ever sees it.

Reading by Tim Foley.