Abstract: A system and method for verifying user interactions is disclosed. User profiles are associated with mobile devices 12. The mobile devices have data network connection means (e.g. a WiFi or mobile data connection to the internet). The data network connection may be subject to the availability of external infrastructure and is not therefore constantly available. The mobile devices also have short-range direct broadcast communication means (for example Bluetooth® radios). The short-range direct broadcast communication means does not rely on external infrastructure and therefore direct broadcast communication can be made from one device to another as long as the two devices are close enough together. The system and method allows a connection to be verified between two users who are physically in the same place, whether or not the users' devices both have a current data network connection.