As digital platforms continue to evolve, youths increasingly employ social media, online forums, and digital campaigns to advocate for social and political change. While this phenomenon is often considered disparagingly as slacktivism, recent studies find that individuals engaging in digital activism often also participate in other conventional forms of activism. Despite a surge in youth activism across Southeast Asian countries, comparative analysis in this region remains scarce. Using data from the World Values Survey of several studies, and case studies on Indonesia, this article examines the extent to which online political activism serves as a catalyst for mobilization, awareness and community building among young people in Indonesia, Malaysia, Thailand and the Philippines.