Since the creation of social media platforms, sport researchers have used relationship marketing as a conceptual and theoretical framework for studies on social media in sport. While many of these studies have contributed to our understanding of relationship building on social media, there is much room for advancement. This special-issue commentary provides a brief overview of the scholarship on relationship marketing and social media in sport and then suggests areas for advancement. It ends with specific recommendations for moving from using relationship marketing as a framework to testing the theory in sport social media research and expanding on its application to understanding relationship building on social media in sport.