Social media is integral to students' lives. Pinterest, an online social network for "Pinning" (sharing) links and images, is the fastest-growing social media tool in history. The purpose of this investigation was to determine the effectiveness of a semester-long active-learning assignment using the Pinterest platform. Forty-nine students (42 female; 18 psychology majors) enrolled in a Lifespan Development course contributed data to this investigation. Students used Pinterest to apply their knowledge of developmental theory and research to two celebrities or fictional characters of their choice. At the end of the semester, students completed a short questionnaire in which they reported on their experiences with the project. Participants also consented to have their academic achievement data (course grades) analyzed in aggregate. Results indicate that students enjoy the Pinterest platform and that they perceive learning more from the assignment than from other assignments in this and other courses. However, some students reported struggling with practical concerns of the platform, including difficulty in adjusting to an unfamiliar platform. Results suggest that Pinterest can be used to encourage student learning but that instructors must take care to ensure that assignments in this medium are inclusive of a broad range of students.