The other day, I got an email advertising ‘miracle’ weight loss. You know the sort: English as defined by Boggle and no way on earth that anyone would ever buy the product in question. I opened it without thinking, and was redirected to a blank page. Within minutes, my Hotmail, Twitter and WordPress accounts had gone haywire; I stared at my computer screen as the original message replicated itself and fired off to every single one of my contacts.