Social media is widely used but few studies have examined how patients with advanced cancer want their accounts managed after death. The objective of this study was to determine the proportion of our patients with advanced cancer who have discussed the post-mortem management of their social media accounts with their family or friends. This was a cross-sectional survey in which patients with advanced cancer at an outpatient Supportive Care Clinic at a tertiary cancer center completed a novel survey on social media use that assessed patients' social media use practices, attitudes and preferences, and reactions to the survey. Of 117 patients, 72 (61.5%) were women, and the mean age was 56.4years old. We found that 24 (21%) of our patients have discussed their preferences for management of their social media accounts after death. Patients with a lower annual income were significantly more likely to report having such conversations (p = 0.0036). Completing the survey motivated 76 patients (67%) to discuss their social media accounts and 82 patients (71.3%) to explore how social media will be managed after their death. Half of our study participants reported social media as an important source of coping. Few patients have had conversations on the management of their accounts after death, although more were interested in exploring their options further. More research is needed to examine the role of social media as a digital legacy and a coping tool for patients with advanced cancer.