An electronic device of a first user configured to connect with a second electronic device of a second user over a first peer-to-peer wireless network link; send to the second electronic device, a first unique code generated by the first electronic device, corresponding to a first user identifier of the first electronic device; receive from the second electronic device, a second unique code generated by the second electronic device, corresponding to a second user identifier of the second electronic device; store the second unique code; store on the first electronic device, information indicating the proximity of the second electronic device and the time when it is within the communicable range of the first electronic device; retrieve from a coupled backend database stored in a cloud, a third unique code; and, upon determining that the third unique code matches the second unique code, display a notification on the first electronic device.