Violence has generally fallen since the early 90's, or at least data collection of violence has fallen, and the suspected reason is technology. Cell phones, in

Violence has generally fallen since the early 90's, or at least data collection of violence has fallen, and the suspected reason is technology. Cell phones, internet, video games, might not only lower street crime (by changing drug distribution) but also, through social atomization, by giving people alternative social outlets than ones full of people they'd get into altercations with. So one angle is direct social technology designed to somehow lower the crime rate. Just spitballing here, how about some improved version of NextDoor? Another angle: Make it easier to talk to the police. For example, in Baltimore, a lower proportion of murders are getting solved than a few years ago because people won't give police information, and there is now a higher rate of murders, too. To improve the rate at which people report crimes, make it much easier for people to talk to the police. Have the social networks expose the local police department as part of the community in some way. (I don't really know how to make this work.)