Clay Shirky recently published an essay at Poynter about the challenge of fostering trust when ideas in the public sphere are no longer scarce.
A relevant excerpt:
The philosophy of news ethics — tell the truth to the degree that you can, fess up when you get it wrong — doesn’t change in the switch from analog to digital. What does change, enormously, is the individual and organizational adaptations required to tell the truth without relying on scarcity, and hewing to ethical norms without the ability to use force.
Incidentally, the idea expressed in that excerpt is similar to the conclusion drawn by Jane Singer in “Norms and the Network: Journalistic Ethics in a Shared Media Space.”