I. Introduction
As part of an ongoing effort to promote equitable participation in online communities for all youth, we present our work developing features of iRemix, an online social learning network for use in varied formal and informal 5 -12 grade learning contexts. This online environment is designed to foster sharing and interaction around student digital media projects. Research questions for this study include: 1 How do Latino youth interact around submitted digital artifacts and 2 How can we design features to better support their contributions of communication and critique? In this paper, we address these questions through a detailed examination of the design of the reactions feature, which emerged through a collaborative research and development process with teachers and students. We report on two design iterations in authentic classroom settings and the design decisions that informed the iterative development. With a fundamental concern for encouraging equitable access to 21 st century skill development for Latino students, we highlight important cultural and pedagogical design considerations for social learning network interfaces that are meant to build learning community.