From green ink to digital bile These letters wouldn't make it to print. They went on and on and, well, on, often with intemperate language. They were often more about the writers than the subject. Nevertheless, we knew who was writing in, because the custom of letter writing was and is to include your name and address. These days instead of green ink, there are emails to newspapers where people go to extraordinary lengths to vary font sizes and use the full Microsoft Word toolbox. Red appears to be the new green. They still rarely make it into print - look at the length of letters that do. Still, it's cheaper than therapy. In 2013 green-ink letters have become online reader comments beneath articles which are usually post- rather than pre-moderated (it's about the publisher's resources). On some notable places (Mail Online, Gawker) these become part of the site's attraction. Sometimes you know who they are, sometimes not. At other times you simply think you do. Bullies hide behind anonymity, because bullies are cowards. And then there is the relative Wild West of Twitter and Facebook. The stories about young people being bullied on Facebook are legion, and both individually and collectively heartbreaking. The faster that Facebook cracks down - and it has been nowhere near fast enough - new places where teenagers are foul to each other spring up: ask.fm is horrible. Twitter was rightly the focus for this modern-world dilemma over the weekend because of the cyberspace bullying of Caroline Criado-Perez. In return for having the temerity to campaign for women to be featured on banknotes Criado-Perez suffered multiple rape threats and other horrendous abuse. She received 50 abusive tweets an hour for 12 hours and turned to the police for help when Twitter would not engage. Now there is a thousands-strong petition at Change.org, calling on Twitter to add a "report abuse" button. I urge you to sign it. And I also urge you not to dismiss all this as "sticks and stones..." Because when words become the public publishing of home addresses and threats of rape and violence, words can clearly hurt you. And let's all begin to change this disturbing culture of anonymous 'trolling' by calling it what it is: bullying.