Background As the use of social media to mediate learning in the occupational therapy profession gains increasing recognition, calls for tangible guidance with concrete and platform-specific examples have also become prominent. Aims This study aims to describe and analyse the various learning activities qualified occupational therapy practitioners engage with in professional communities known as ‘groups’ on the Facebook social media platform. Method Forty-nine (n = 49) practitioners eligible for registration with the Health and Care Professions Council in the United Kingdom completed online questionnaires to produce one-hundred and ten (n = 110) critical incident reports. Data were thematically analysed. Results Six learning activities were inductively identified: (1) Acquisition of New Ideas; (2) Reinforcement of Existing Knowledge; (3) Adjustments to Existing Knowledge; (4) Learning about Resources; (5) Learning related to Career Advancement; (6) Learning related to Hidden Curriculum. Conclusion This study showcases the varied ways occupational therapy practitioners learn through Facebook Groups, evidencing the utility of this professional learning environment. Significance Findings enable occupational therapy practitioners to better evaluate which activities to engage in on Facebook Groups for learning and development of higher-quality professional practice. Further research examining the utility of Facebook Groups for professional learning in contrast to other social media platforms is recommended.