Suffering an irritation that just won't go away? It's probably a nasty case of 'viral marketing', a technique that's as easy as catching a cold - or spreading one. A company creates something so cool that its customers want to tell all their friends: they e-mail or text everyone in their address book. Then those friends do the same, and so on. It's instant, and costs virtually nothing. Great news, unless your company is the butt of the joke. That's when you recall that 'virus' is Latin for poison.
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Innovation, joy and fear feature in our list of new releases.
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