PURPOSE: In this study, we identified the social and psychological characteristics of Danish cancer patients that determine use of the internet for support. MATERIALS AND METHODS: We invited 230 cancer patients taking part in a public rehabilitation program to participate in an internet module comprising training in the retrieval of cancer-related information from the internet and self-support groups. Persons who were motivated to join the internet groups (N = 100; 47%) were compared with persons who chose not to participate (N = 111) on the basis of self-reported baseline questionnaire data. Nineteen persons either did not return the questionnaire or had missing values in confounding variables. RESULTS: Cancer patients who were motivated to participate in internet support groups belong to higher socioeconomic groups (based on household income and employment) compared to non-participants. We observed no difference between the two groups in quality of life or psychological well-being, while coping to some extent seemed related to participation in internet support groups. CONCLUSION: This study adds to the discussion on social inequality in internet use by cancer patients, showing that patients who are not inclined to use internet-based interventions are characterized by social position and employ more passive coping strategies.