The FB approach: we will pay for some small amount of data that anyone can use, but we will determine what you can reach. We will make money by getting fees from the content providers we allow into this walled garden.
The Steve Song approach: some of the profits of wireless providers will be mandated to go to a very low speed service that anyone can use for any purpose. The wireless providers may or may not make the money back from increased utilization by new and existing fee-paying subscribers who see increased value in the network. If it doesn't make money, it's not a problem: the social benefits outweigh the very small cost.