We used an online questionnaire study of volunteers working for the German Red Cross (GRC) to analyze whether Internet use is correlated with the commitment of volunteers. We measured commitment multidimensionally in terms of the willingness of the volunteers to donate, their reported willingness to expand their volunteer work, and their satisfaction with their volunteer work. Upon controlling for numerous socioeconomic factors, we found that volunteering-related use of the Internet is positively correlated with commitment while Internet use for leisure-related activities does not exhibit such a positive correlation. We derive our findings using a micro data set that contains information on the intensities and forms of Internet use of volunteers. Our findings contribute to the literature on the implications of Internet use for social capital and the social integration of users.