This disclosure describes systems, methods, and apparatus for determining proximity between networked devices without requiring those devices to share location information either because of privacy or because such information cannot be obtained. To do this, access points for a plurality of networked devices are compared, and those devices detecting, or detected by, the same access points are deemed proximal to each other. Software, or features of software, can be initiated on those networked devices that are proximal to other networked devices and the proximal networked devices can be given information enabling them to identify and communicate with each other.