"Some things are the same as ever: The bigger your distribution platform, the more impact you have. But in the old days, people with the big guns developed an ethical code to deal with this responsibility. They created a culture that said, "You must get things right or you will pay for it with your job and credibility." Nowadays, there are many more small distribution channels, people who influence their friends. And they don’t have the same sense of responsibility, nor any incentives to encourage them to get one."
(via If You Can’t Beat ‘em, Subvert ‘em: Countering Misinformation on the Viral Web - Alexis C. Madrigal - The Atlantic)