“Viral loops expand according to what’s known as a Power Law Curve, which, for reasons no one can explain seem to accurately describe a dizzying array of natural and unnatural phenomena, from the size of planets to national income distribution to online commerce. But another implication of viral expansion is that once a company attracts a certain number of users, it becomes all but unstoppable.”
Ning’s Infinite Ambition - Fast Company
Viral loops and social network startups.