Rodrique Ngowi, Associated Press
SEATTLE — The intensive manhunt for the bombers behind the deadly Boston Marathon attacks didn't take place only on the streets with professional police officers and SWAT teams. In an era of digital interactivity, it also unfolded around the country from laptops and desk chairs filled with regular folks.
Fueled by Twitter, online forums like Reddit and 4Chan, smartphones and relays of police scanners, thousands of people played armchair detective as police searched for men who turned out to be suspects Dzhokhar and Tamerlan Tsarnaev, ethnic Chechen brothers who had immigrated from southern Russia years ago.
But as amateur online sleuths began identifying possible culprits, caught in the virtual manhunt were people who were wrongly accused or placed under suspicion by crowdsourcing. It showed the damage that digital investigators can cause and raised a relevant question: In the social-media generation, what does law enforcement unleash when, by implication, it deputizes the public for help?
"The FBI kind of opened the door," said Hanson R. Hosein, director of the University of Washington Master of Communication in Digital Media program. "It was almost like it was put up as challenge to them, and they rose to it. ... They can be either really helpful or mob rule."
The bombings have been the highest-profile case in which the public has joined an active investigation, using ever-evolving crowd-sourcing tools, showing the pitfalls and benefits of new technology. It's certainly not vigilantism, but it's not standard policing, either. It's something in the middle, perhaps something new — the law-enforcement equivalent of citizen journalism.
As authorities asked the public for help, Reddit users began piecing together clues in the pictures and videos. They pointed out men who were wearing backpacks standing in the crowd. They looked at the straps of backpacks to compare with the one thought to have carried the bomb. They analyzed the bombs' blasts and people's gazes. In one particular photo thread, posted on imgur.com shortly after the bombing, a user attempted to pinpoint exactly where the bomb was placed.
"I'm seeing a lot of confusion and misinformation from news sites about where each bomb was detonated. After combing through the photos I've seen, I believe I've been able to make a solid case as to their exact location, where 'exact' in this case has an error margin of about 2 meters," user "gdhdshdhd" said.
Eventually, efforts and pictures posted in the sub-section dubbed "r/findbostonbombers" and elsewhere on Reddit were picked up by news organizations with more readers, giving it greater exposure.
Another wave of detective work happened after the FBI released pictures and videos of the Tsarnaev brothers and as initial reports of a shooting at Massachusetts Institute of Technology on Thursday night. While listening to the police scanner, Reddit and Twitter users thought they had heard the name of a Brown University student missing since March, and one user posted a news story about his disappearance.
That assumption proved wrong — and there was a cost.
The missing student's family, besieged with ugly comments, temporarily took down a Facebook page asking for help finding him. A few hours later, the online detectives said sorry — in the words of one moderator, "Rather Confused," for "any part we may have had in relaying what has turned out to be faulty information." Several Reddit users who posted on r/findbostonbombers did not immediately return messages seeking comment.
The president seemed to acknowledge this Friday night, speaking after the second suspect was captured. "In this age of instant reporting, tweets and blogs, there's a temptation to latch on to any bit of information, sometimes to jump to conclusions," Barack Obama said. "But when a tragedy like this happens, with public safety at risk and the stakes so high, it's important we do this right."
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