A gaze initiated interaction technique for facilitating interaction between wearers of head-mountable devices. Methods are shown which allow users to interact with each other following an event of interlocking gaze. Methods are also shown which allows the operator of a personal point-of-interest beacon to control and limit interaction from the public thus ensuring a greater degree of privacy. Methods are also introduced which allow a mode of interaction to be determined by a remote service after mutual authorization of each interacting user. This disclosure also introduces a system of a head-mountable device which comprises a directional beacon transceiver system using beams in the infrared light spectrum enabling the detection of a gaze interlock event.