Would the Daily Mail website fall foul of the online porn filters it has championed?

Ban this sick filth. No, not THIS sick filth, obviously.

David Cameron wants to block online porn, the Daily Mail reported approvingly this morning.

 

Now comes the big question: where the line should be drawn. If you're too lax, things slip through the filter; if you're too strict, non-pornographic images or sites get caught in the net. How do you tell what's pornographic and what isn't? "I know it when I see it," said Justice Potter Stewart in 1964. But it isn't that simple.

Despite the best efforts of programmers everywhere, you can't just tell a computer "block any page with an image or video of a female nipple or male or female genitalia" (a rule which, itself, would be hopelessly over-strict; farewell Titian! So long, Leonardo!). Instead, most blocking software uses contextual clues on the page to work out whether the site itself is problematic. That can be obvious: there are few safe-for-work sites which use the phrase "double penetration", for instance. Except this site, now – which explains part of the issue.

Existing filters show that if you want to make the blocking comprehensive, some of the contextual clues used have to be broad enough to make collateral damage certain. Blocking anatomical terms like "vagina" or "anus", for instance, frequently leads to sites discussing sexual health or feminist topics being caught up.

Meanwhile, humans - being cleverer than filters - learn to use terms which can't be blocked because they also have innocuous uses. (Take, at the extreme end, the use of "Lolita" to denote images of child abuse.)

The thing is, even if all the technological quirks were worked out, drawing the line is still hard, just in terms of choosing how prudish we as a nation are. So where do we start blocking?

Pictures of women in their underwear?

 

 

Sexual, nude but non-explicit photos?

 

 

Pictures of women with clearly visible breasts?

 

 

Topless pictures of prostitutes in 1940s Paris?

 

 

Playboy style photo-shoots?

 

 

Non-explicit pictures of people having sex?

 

 

Well, would you want your children seeing that kind of material? Ban this sick filth.

Oh, Daily Mail. Photograph: dailymail.co.uk

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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Nigel Farage's exclusive Brexit plan has just been revealed and it's very telling

The panic is over.

If, a week on from Brexit, you're staring at the bottom of your gin bottle and wondering whether you'll ever afford to go on holiday again, then stop worrying. 

There's a plan.

Social media users have been sharing a link to an exclusive reveal of Nigel Farage's plan for the UK departure from the EU. Users are invited to: "View The Brexit Plan that was but together by the Vote Leave campaign, UKIP and Nigel Farage.

Here it is.

Highlighted policy topics include hot potatoes like UK access to the single market, international trade agreements and the rights of EU nationals working in the UK. You just have to click on the red button.

 

Oh. 

It seems the plan might be permanently out of reach. 

Every time you try to click on the red button with your mouse, you'll discover that it leaps away to another part of the page. So far, we haven't heard of anyone who has managed to catch the elusive button and discover the details of the brilliant plan. 

Other plans that have not been very easy to click on this week include: Boris Johnson's plan to be Prime Minister, Jeremy Corbyn's plan to lead a unified Labour opposition and David Cameron's plan to win the EU referendum in the first place.

As it turns out, a week after Brexit we are still waiting for a definitive plan. In the meantime, you can read: