At Wednesday’s Senate hearing on the future of journalism, traditional journalists sounded alarms about their struggling industy. Yet two of the witnesses, Marissa Mayer of Google and Arianna Huffington of the eponymous Huffington Post, represented the new-media aggregators that rely on others’ original content. Mayer and Huffington both had to respond to senators who highlighted their role in killing newspapers. Sen. Kerry lamented: “I see cacophony without standards. I see more and more people operating in public life with snippets, and I think that’s dangerous.”