Cyber-crime knows know borders, so nor should our defences.
For those who want their own digital space there are other networks than the internet.
"Come and find me," said the man who didn't believe it was easy to find people on the net, giving his real name. Twenty minutes later, I knew his address, university and current height and weight.
What we know about the men (and sometimes women) who spend their days trying to provoke a reaction on the internet.
It would be nice to think that the rot of rank misogyny was confined to fringe sites populated by lunatics. But it is found all over the web - and it's silencing its victims. Fighting it is not the same as censorship.
DSMO, the website that abused Mary Beard, did far more than host threads dedicated to obscenity and offence. Its users took delight in bullying and harrassing their victims.
Digital populism in Italy.
From Jeff Jarvis to Clay Shirky, a class of gurus are intent on "disrupting" old-fashioned practices like asking us to pay for valuable content. Meanwhile, web giants like Google and Apple jealously guard their profitable secrets.
This week we are producing a digital version of the New Statesman in Mandarin, to evade China's internet censors. Here's why.