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.

Photo: Getty Images
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What do Labour's lost voters make of the Labour leadership candidates?

What does Newsnight's focus group make of the Labour leadership candidates?

Tonight on Newsnight, an IpsosMori focus group of former Labour voters talks about the four Labour leadership candidates. What did they make of the four candidates?

On Andy Burnham:

“He’s the old guard, with Yvette Cooper”

“It’s the same message they were trying to portray right up to the election”​

“I thought that he acknowledged the fact that they didn’t say sorry during the time of the election, and how can you expect people to vote for you when you’re not actually acknowledging that you were part of the problem”​

“Strongish leader, and at least he’s acknowledging and saying let’s move on from here as opposed to wishy washy”

“I was surprised how long he’d been in politics if he was talking about Tony Blair years – he doesn’t look old enough”

On Jeremy Corbyn:

"“He’s the older guy with the grey hair who’s got all the policies straight out of the sixties and is a bit of a hippy as well is what he comes across as” 

“I agree with most of what he said, I must admit, but I don’t think as a country we can afford his principles”

“He was just going to be the opposite of Conservatives, but there might be policies on the Conservative side that, y’know, might be good policies”

“I’ve heard in the paper he’s the favourite to win the Labour leadership. Well, if that was him, then I won’t be voting for Labour, put it that way”

“I think he’s a very good politician but he’s unelectable as a Prime Minister”

On Yvette Cooper

“She sounds quite positive doesn’t she – for families and their everyday issues”

“Bedroom tax, working tax credits, mainly mum things as well”

“We had Margaret Thatcher obviously years ago, and then I’ve always thought about it being a man, I wanted a man, thinking they were stronger…  she was very strong and decisive as well”

“She was very clear – more so than the other guy [Burnham]”

“I think she’s trying to play down her economics background to sort of distance herself from her husband… I think she’s dumbing herself down”

On Liz Kendall

“None of it came from the heart”

“She just sounds like someone’s told her to say something, it’s not coming from the heart, she needs passion”

“Rather than saying what she’s going to do, she’s attacking”

“She reminded me of a headteacher when she was standing there, and she was quite boring. She just didn’t seem to have any sort of personality, and you can’t imagine her being a leader of a party”

“With Liz Kendall and Andy Burnham there’s a lot of rhetoric but there doesn’t seem to be a lot of direction behind what they’re saying. There seems to be a lot of words but no action.”

And, finally, a piece of advice for all four candidates, should they win the leadership election:

“Get down on your hands and knees and start praying”

Stephen Bush is editor of the Staggers, the New Statesman’s political blog.