I think we are going to need a new term for legitimate ponzi schemes to help identify them now that anything somebody doesn't agree with: FB, social security, socialized medicine, unions, groupon, quantitative easing, bailouts, unicorns, etc... are now routinely written off as "ponzi schemes".
no kidding. ponzi scheme is pretty easy to define. overvalued stock is not ponzi, it is just an overvalued stock. ponzi is paying earlier "investors" with the money of later "investors". Under that definition, only social security from your list fits even close.
