A recent wave of Internet-related entrepreneurship focused on virtual communities. It produced User-Community-Driven Internet ventures (UCDI-ventures), characterized by (1) user-contributed content, (2) network effects, and (3), an interactive community. Whereas light pole examples such as YouTube, MySpace, or Facebook have received high capital market valuations, many other ventures have failed, making research on the phenomenon and related success drivers worthwhile. This paper integrates three general venture success drivers from the entrepreneurship literature and two specific UCDIventure related ones. Drawing on the case of the online video sharing community Clipfish in Germany, it demonstrates the relevance of the proposed UCDI-venture success drivers. The paper concludes with an assessment of the five success drivers and suggests three steps of future research.