Recent studies indicate a steady decline in voluntary association membership in Taiwan, which may hinder civil societal development. However, these studies have paid little attention to the role of informal social interactions. Using data from the Taiwan Social Change Survey, I examine voluntary association membership trends vis-à-vis the degree of daily contacts, which I argue is a more encompassing type of social participation. Similar to joining voluntary associations, daily contacts are positively associated with the survey respondents' political efficacy, discussion of public issues, and normative perceptions of citizens' duties and obligations. The extent of daily contacts has remained high since the late twentieth century, although with some changing patterns. In particular, contacts with unknown others increased between 1997 and 2010, indicating more fleeting social interactions. The findings suggest a diversifying pattern of social participation that probably reflects macro-level trends in new technology, social media, and globalization.