Little revenue potential? That's a crazy thing to say, anyone with 600 million users has a fairly decent revenue potential... Now what about when you know every single detail about those 600 million people's lives... HUGE revenue potential.
It doesn't matter how many users you have or how much information you have if you can't monetize it, especially when you have to categorically rule out all the obvious options (charge people money to use the service, sell people's private information) and other feasible options (sell devices designed to integrate with Facebook) are instantly shot down by the company's own efforts (free iPhone and Android apps).
Maybe Facebook will find a way to make tons of money, rather than merely tons of hype. As it stands, I bet the number of users they have represents high cost rather than high revenue potential. It's definitely too big to go away, but unlike Groupon, it also hasn't found a way to make tons of money yet, and no method to do that seems forthcoming.
