Purpose: To understand how the social network of patients with acquired brain injury facilitates or hinders resumption of their activities, such as social and leisure activities, and how this affects patients' wellbeing and quality of life. Methods: Thematic analysis was applied to 70 narratives about family members, friends, neighbors and colleagues helping or hindering patients in resuming their activities. The narratives were derived from social workers with extensive experience with brain-injured patients and their social networks. Results: The narratives show that an available, understanding and well-informed network enhances activity resumption by being inclusive and encouraging patients to develop their skills. This is in line with earlier studies based on patients' experiences. Whereas the patient-based studies emphasize that being unsupportive or overprotective hinders patients from resuming their activities, this study also shows that preventing patients from meeting others or placing too-high demands results in activity loss, social isolation and reduced well-being and quality of life. Conclusions: Several social network factors play a role in activity resumption, well-being, and quality of life of after brain injury. Early after the brain injury, rehabilitation professionals should work with patients' family members, friends, and others and educate them about how to provide adequate support. ä IMPLICATIONS FOR REHABILITATION Since the patient's social network is an important determinant of activity resumption, rehabilitation professionals should analyze its features soon after brain injury, such as whether patients have an understanding network that encourages them and includes them in their activities. Since especially close network members tend to be protective of or place high demands on the patient, rehabilitation professionals should explain to them the importance of activity resumption for the patient's wellbeing and the adverse effects of being overprotective or over-demanding. Rehabilitation professionals should include other network members, such as friends or colleagues, in the rehabilitation process and educate them about how to support patients in resuming their activities.