I made a video on how to locate earthquakes using Swarm. In many areas of the world now there are enough RShakes to be able to locate events. The density you need is 6 to 10 stations in a circle of 50 to 100 kilometers in diameter. I am planning to make a follow-up video to help dial in the magnitude and how to see how good your location is. Here is the link:
Good hunting for little earthquakes.