Systems, devices and methods are provided for solving technical problems related to communicating between two or more unrelated mobile devices based on location without needing contact information for the unrelated mobile computing devices. In various implementations, the service is adapted to use a common user base for a location-based matching process. In some implementations, a rough order of magnitude is maintained for users until the user is identified as a potential responder to a location-based request at which time a location request may be made to a mobile computing device. Further, parallel location based requests, such as surveys, may be performed.