An anonymous reader writes: Six months ago, Detroit's city officials launched a smartphone app called "Improve Detroit." The idea was to give residents a way to easily inform city hall of problems that needed to be fixed. For example: potholes, abandoned vehicles, broken hydrants and traffic lights, water leaks, and more. Since that time, over 10,000 issues have been fixed thanks to reports from that app. "Residents have long complained about city hall ignoring litter and broken utilities. But the app has provided a more transparent and direct approach to fixing problems." Perhaps most significant is its effect on the water supply: running water has been shut off to almost a thousand abandoned structures, and over 500 water main breaks have been located with the app's help. Crowd-sourced city improvement — imagine if apps like this become ubiquitous.