They say there’s a smartphone app for everything, and doubters should know there are now at least two dealing with excrement on the sidewalks of San Francisco. The city has its official SF311 app, part of its “San Francisco at your Service” program, and last year a private developer introduced Snapcrap, which allows residents to upload a photo of an offending specimen directly to the SF311 website. This alerts the city’s new five-person “poop patrol,” which will follow up, presumably, with a smile.

Then there are the maps....