This study explores the relationship between Canadian millennials’ online activities and their attitudes toward politics. We draw upon longitudinal data from the Canadian Youth Study (CANYS), a two-wave survey conducted eight years apart (n = 967), and present models looking at the influence of online activities and the early adoption of Internet on three common attitudes toward politics. The analysis suggests that engaging in interpersonal communication and searching for information online increases political interest. Furthermore, this also increases external political efficacy. Meanwhile, engaging in interpersonal political communication online decreases trust in the federal government, which is otherwise increased by online social networking with friends and family. Early adoption has no effect. Results suggest that online activity has an overall positive effect on attitudes toward politics with a seemingly contradictory effect on trust.