One Monday morning last September, Britain woke to a depraved news story. The prime minister, David Cameron, had committed an “obscene act with a dead pig’s head”, according to the Daily Mail. “A distinguished Oxford contemporary claims Cameron once took part in an outrageous initiation ceremony at a Piers Gaveston event, involving a dead pig,” the paper reported. Piers Gaveston is the name of a riotous Oxford university dining society; the authors of the story claimed their source was an MP, who said he had seen photographic evidence: “His extraordinary suggestion is that the future PM inserted a private part of his anatomy into the animal.”

The story, extracted from a new biography of Cameron, sparked an immediate furore. It was gross, it was a great opportunity to humiliate an elitist prime minister, and many felt it rang true for a former member of the notorious Bullingdon Club. Within minutes, #Piggate and #Hameron were trending on Twitter, and even senior politicians joined the fun: Nicola Sturgeon said the allegations had “entertained the whole country”, while Paddy Ashdown joked that Cameron was “hogging the headlines”. At first, the BBC refused to mention the allegations, and 10 Downing Street said it would not “dignify” the story with a response – but soon it was forced to issue a denial. And so a powerful man was sexually shamed, in a way that had nothing to do with his divisive politics, and in a way he could never really respond to. But who cares? He could take it.

Then, after a full day of online merriment, something shocking happened. Isabel Oakeshott, the Daily Mail journalist who had co-written the biography with Lord Ashcroft, a billionaire businessman, went on TV and admitted that she did not know whether her huge, scandalous scoop was even true. Pressed to provide evidence for the sensational claim, Oakeshott admitted she had none.

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Some of the web’s biggest destinations for watching videos have quietly started using automation to remove extremist content from their sites, according to two people familiar with the process.

The move is a major step forward for internet companies that are eager to eradicate violent propaganda from their sites and are under pressure to do so from governments around the world as attacks by extremists proliferate, from Syria to Belgium and the United States.

YouTube and Facebook are among the sites deploying systems to block or rapidly take down Islamic State videos and other similar material, the sources said.

The technology was originally developed to identify and remove copyright-protected content on video sites. It looks for "hashes," a type of unique digital fingerprint that internet companies automatically assign to specific videos, allowing all content with matching fingerprints to be removed rapidly.

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