A system including a memory for storing a contact list of records each record including a contact name, a mobile device phone number, and a list of location entries, each entry comprising a location name, a location phone number, a location address, and location geographic coordinates, and a locator for receiving as input a designated contact name, for obtaining current geographic coordinates of the designated contact's mobile device, for obtaining current geographic coordinates of at least one other mobile device, and for generating as output at least one proximal entity, each proximal entity including either the name of a contact whose mobile device is currently located close to the designated contact's mobile device, or the name of a contact and the name of a location associated with the contact, the location being currently close to the designated contact's mobile device.