More info on Skype:
Niklas Zennstrom co-author of Kazaa talks about Skype. “You should not try to do things that are artificially viral like an “Invite a friend to use this service” feature. Those don’t really work. We’ve had that feature on Skype but it doesn’t really bring in the users. The product has to be fundamentally viral in itself.”
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I agree, but if the product is viral, the functionality to simplify its sharing should help maximize the viral effect.