When we are using sensors to ‘listen’ for the WiFi discovery messages transmitted by the device there is no way for us to tie that specific device to an individual. However, we do support a number of WiFi captive portals (a captive portal provides the popup page you see when connecting to free WiFi at hotels, events etc) which commonly ask the user for some information to authenticate such as name, email address etc. Some portals also support login via social network credentials such as Twitter or Facebook. If these methods are used Exposure Analytics can tie the unique MAC address to a specific individual. We encourage our clients to state explicitly within the terms of connectivity that this information is being retained.