The purpose of this study was to explore teachers' perceptions and patterns of their activities on a participatory platform for cultural heritage content creation and dissemination. Using a convenience sample of participants, eight in-service teachers enrolled in a postgraduate program were invited to the study. Qualitative research methods were used, including (a) interviews with in-service teachers, (b) focus group discussions with two randomly selected teachers, the instructor of the course and an ICT expert as a digital content evaluator, and (c) observation of teachers' activities patterns on the participatory Culture Gate platform. The results of this study highlight, as well as encourage discussion on how teachers can learn through online collaboration and also aims to identify factors connected with teachers' professional development within a pedagogic framework.