Google, Twitter & Facebook: Platforms or publishers?

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This may seem not so interesting on the face of it, but it highlights the various steps that have been taken over the last couple of years by the big tech companies to control the flow of information.? It?s obviously getting so much publicity because of the renewed interest in free speech.? I used to think allowing holocaust denial, and books like Hitler?s Mein Kampf to be banned was fine.? I pretty much take the opposite view now, I?m happy for people to espouse whatever they like, I?d rather debate and question, even if I don?t like the answers.