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This is the establishment's unifying achievement - a non-binding agreement that will nonetheless serve as a blueprint for future international regulation. If adopted, for most living in the West, there would be no escape.

It is very possible that these new tools will be used cautiously - filtering out only the guns and splatter. But with definitions of hate speech and what is considered extremist being systematically broadened, over time - years? months? - there will be appeals to use these technologies to suppress more and more voices.

And judging by the previous record of the social networks involved, the losers will be the "Islamophobes" and the "transphobes" and the "Russian trolls" - real or imagined - and not the radical feminists calling for all men to be castrated, nor Antifa protesters in balaclavas filming themselves disrupting a campus speech.

While the document talks about the need for "transparency" and "an efficient complaints and appeals process" for any censorship, it leaves both the decisions and the implementation to the tech companies themselves. "Enforcing community standards or terms of service" will still be king - so if a Twitter mod wants to close your account it will be his call and enshrined right.

This is also bound to have a chilling effect on contributors who know that one over-the-line video will exile them from all the biggest internet forums, and deprive them of their income streams.

Less clear is whether pushing the marginalized into the darker corners of the internet actually helps to prevent the flourishing of extremism, or will create a parallel underground network that will be far more radicalized. Imagine a bigger and more toxic 4chan for all the rejects, if you can.

What is certain is that any filtering, reporting and pre-moderation technologies developed as a result of the Christchurch Call will be adopted with enthusiasm by genuinely repressive regimes, and likely deployed by the California giants themselves at the request of such governments, who will cite their own anti-extremism legislation.

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