I think that's besides the point. Skype-out was not the method of solving the chicken-egg problem. Incentive to spread was the solution. We don't have to stick

I think that's besides the point. Skype-out was not the method of solving the chicken-egg problem. Incentive to spread was the solution. We don't have to stick with Skype either. Facebook solved their (enormous) chicken-egg problem by targeting specific Universities.