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In the ongoing debate about Twitter and social media, one of the most frequent complaints is the sheer abuse that passes for rational discourse.
I've long argued that a certain English writer must have tired of Elizabethan trolls sending him abusive parchments which started: "Mr Shakespeare, you are nothing but a popinjay and your plays are more pestilential than a Frenchman's breath."
The thing is, angry people have always been with us. And angry people used to have to go to the effort of finding parchment and quill, or pen and paper, before firing off their squalid missive. Not any more.