Share 'App - people are infected or survivors - can get tagged and turned by othe infected'

Idea for smartphone app whereby its a mass roleplay system where people are infected or survivors and infected get to tag survivors to turn them. Like a survivor might be in a cafe somewhere and nearby an infected and the app is such they can see other players so the infected comes to the cafe and within a certain distance tags the survivor turning him. Or else the survivor hunts infected using h…