By Christopher Mims 

BALTIMORE--The first I heard of Monday's riots here was on Facebook. In a parent group usually populated by requests for play dates, a mom posted that violence had broken out not less than a mile from my home. After days of peaceful protests, I was at first incredulous. I looked out my window at the sedate cafe across the street: Nothing out of the ordinary.

But there on Twitter, my feed was lighting up from the moment the first rocks were thrown by teenagers, at police, in the Mondawmin area of Baltimore. Why was this happening? How big would it get? What should I do and/or think about it?

That's when I had a uniquely personal realization about the power of technology in a crisis: It's easy to become jaded about the power of social media, but it is a colossal mistake to take it for granted.

Yes, we've heard about the power of social media many times before--from the Arab Spring to the documentation of police brutality all over America. But something unique is happening at this point in history, even at what feels like a relatively mature stage of the development of the technology. Mostly, it has to do with the sheer density of smartphones-- 64% of Americans now own one, and 85% of millennials do.

The result is something that we thought we had before, but I am realizing we can never have enough of: Context.

As activists, journalists and citizens poured into the areas of Baltimore that were being affected, news of events arrived in my feed mere seconds after it occurred. By far the most powerful tool of the night were Twitter lists of accounts from people who were on the ground.

One thing that has happened in past crises covered on social media is the rapid spread of misinformation and rumor. But now, owing to the sheer density of people who were actually there, distributing images, video and firsthand accounts through Twitter, Facebook, Vine and Instagram, I saw rumors pop up and just as quickly get smacked down in the comments.

I could tell who was actually present because they would interact with other eyewitnesses in real time. Instagrams of photojournalists capturing images of tear-gas choked streets would appear before the professionals' work even hit the wires. An easily overlooked account of the complicated genesis of the riots written by a schoolteacher who was there went viral almost immediately.(2b)

And then there was the video streaming Periscope, which seemed to roar to life with a power that I think its creators, at Twitter, had suspected but perhaps rarely witnessed. One journalist approached the pastor of a church whose building--it was to be affordable housing for senior citizens--was set ablaze. The raw and fleeting power of that interview did more to make his plight real than anything else I saw last night, and it's a shame that Periscope still lacks the ability to archive videos for posterity.

For decades we've heard about citizen journalism, but this was something more: It was a sort of hive knowledge, a swarm response. One of its more amazing expressions was that almost as soon as the riots escalated to looting and arson, Baltimore natives started to contextualize the violence, describing their own experiences but also pointing at academic papers and poverty statistics. Even David Simon, creator of The Wire, weighed in.

This morning I ventured out into my city to truth-test some of what I'd seen only through social media last night. There were the smashed storefronts, a torn-open ATM, heaps of trash and broken glass. One grocery store employee outside a boarded up store told me the main thing he'd been fending off all morning were gawkers attempting to take pictures with their cellphones. As we talked, more pulled up, and he politely asked them to move on.

And this, too, was a lesson. Social media's inherent narcissism drove all those early morning commuters to swing by to grab an image for the folks back home--Facebook's version of disaster tourism.

More optimistically, I saw people using Facebook to organize cleanups. By the time the sun was up the corner of North Ave. and Pennsylvania Ave., where the worst of the rioting had occurred, was filled with neighbors--old people, families, kids--sweeping up.

It's hard to imagine how much more frightening the chaos of last night would have been had I not had so many firsthand accounts immediately at my fingertips. And while the genesis of night's riots may have been a flier spread through social media, it was that same media that led pastors and citizens' groups to pour into the streets almost as soon as the riots started, to try to calm the situation. Would the Baltimore riots of 2015 have been worse without the immediacy of social media? It's seems genuinely possible.

Marshall McLuhan said that in the future everyone gets 15 minutes of fame, but he was half wrong. In our world, so many people are having their 15 minutes at once that they become dots in a pointillist portrait of an event. It's one so much more comprehensive, and perhaps truer, than any we could achieve before. It's only going to become more complete as our devices proliferate.

Write to Christopher Mims at christopher.mims@wsj.com

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