Communication is a fundamental social component of human life and constitutes an indispensable factor in the learning process as it allows the transfer of information between people. Communication supports the interactions that take place in different learning stages and settings and can encourage involvement and cooperation. The "Treasure-HIT" platform, a dedicated environment for designing pedagogical mobile location-based games, encourages social interaction and collaborative learning. This platform, which is social at its base, has limited communication capabilities. Adding such capabilities can overcome this difficulty by providing a more supportive and interpersonal interaction among the involved stakeholders. This thesis explores the users' communication needs for the preparation and enactment of "Treasure-HIT" activities. A design based research was used to analyze the needs in terms of design and technological specifications and develop and implement communication features. Three such features were developed in the course of this thesis: (1) Activities based map, (2) Social media sharing feature (Facebook tasks) and (3) Image gallery. All of those aimed at supporting communication between learners, instructors and their community, before, during and after the activities. Findings show that the developed capabilities enabled new means of communication and contributed to the user experience and learning process. Users appreciated the functionality and ease of use and positively adopted the new features.