Electronic sensors co-locate two subject-related persons. A first positioning system on a first communication device determines a first location of a first person within a physical retail store at which a particular type of product is displayed. The first communication device receives a message from a second communication device describing a second location of a second person, who has been predetermined to have used the particular type of product that is displayed at the first location. The first communication device transmits a message to the second communication device requesting that the second person meet the first person at the first location to discuss products being displayed at the first location. The first communication device receives a responsive message indicating an agreement from the second person to meet the first person at the first location, and then transmits, to the second communication device, navigational directions from the second location to the first location.