In building Reddit, a community of thousands of discussion threads, into one of the most frequently visited sites in the world, Huffman has grown aware of the way that technology alters our relations with one another, for better and for worse. He has witnessed how social media can magnify public fear. “It’s easier for people to panic when they’re together,” he said, pointing out that “the Internet has made it easier for people to be together,” yet it also alerts people to emerging risks. Long before the financial crisis became front-page news, early signs appeared in user comments on Reddit. “People were starting to whisper about mortgages. They were worried about student debt. They were worried about debt in general. There was a lot of, ‘This is too good to be true. This doesn’t smell right.’ ” He added, “There’s probably some false positives in there as well, but, in general, I think we’re a pretty good gauge of public sentiment. When we’re talking about a faith-based collapse, you’re going to start to see the chips in the foundation on social media first.”
In the early ’80s on a job for the State Department to reinforce U.S. embassies and consulates following the 1983 Beirut barracks bombings, Pense says he and other government contractors around the U.S. converged on CIA headquarters at Langley, Virginia. The consortium of engineers traded notes and decided that the U.S. power grid was vulnerable. Inadequate, Pense says, compared to everything that’s been hung on it, and that was three decades ago. Three high-altitude electromagnetic pulses (EMPs) could take the whole thing down. Like New York City’s 1977 blackout, looting and pillaging would rule the streets, and that’s if they can get the lights back on quickly enough—if the power stays off for too long, order is lost forever. 
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