This paper comprehensively examines a new type of social media influencer characterized by altruistic tendencies. Utilizing the popular YouTube channel Vlogbrothers as the case study text for a constant comparative analysis, this research explores how the strategies altruistic influencers use to mobilize their community for good, the characteristics of the altruistic influencers, and how altruistic influencers create community. Through an in-depth analysis of 30 Vlogbrothers videos, the themes of education, community, and shared humanity emerged. Education, shared values, and calls to action are discussed as essential for mobilizing communities in charitable endeavors. Authenticity, quality, accessibility, and solutions-focused action were found to be vital characteristics of altruistic influencers. Structure, collaboration, multi-format content, parasocial relationships, and traditions are discussed as community-building tools for altruistic influencers. This research contributes to the existing literature on corporate social responsibility and purpose-driven organizations within the realm of social media influencers. Furthermore, it introduces the concept of "altruistic influencer" as a distinct category within this literature. By outlining the key characteristics and strategies observed in altruistic influencers, this study provides a valuable framework for other influencers to model and encourages further exploration of this field.