This is a bit old (2011) but interesting: a talk at TEDxThessaloniki about how two crimes were solved through a combination of investigative journalism and evidence assembled from the cellphones of a crowd of observers:
“Two murders sat unexplained and unsolved — until reporter Paul Lewis starting talking to bystanders who had evidence on their mobile phones. Step by step, Lewis pieced together their evidence and their stories to find justice for the victims. It’s the future of investigative journalism, powered by the crowd.”
For the first murder, the London Police put out a false story regarding the death of Ian Tomlinson, saying Tomlinson died of natural causes while walking through a protest in London. However, Lewis took to the internet to try to find more witnesses and information, and it eventually surfaced that Tomlinson was beaten to death by a Police officer in the streets.
The second murder involved the British Government covering up the murder of an Angolan political refugee while he was being deported. By taking to Twitter, witnesses on the flight came forward, it was uncovered that the victim, Jimmy Mubenga, was in fact strangled by security guards on the flight whilst they tried to restrain him.
More at TED.com.
(Contributor: Kelly O’Shaughnessy)