Open innovation is firms’ adoption of both internal and external knowledge for products or services innovation, and utilization of both internal and external paths for commercialization. In comparison to traditional closed innovation, open innovation emphasizes engagement with external stakeholders and the environment. Using social media in open innovation can enhance firms’ open innovation by taking advantage of “reach”, “richness” and “affiliation” of social media. Despite a growing amount of research focusing on online innovation communities for open innovation, very few studied the adoption of social media in open innovation. Therefore, in this research-in-progress, we review relevant literature in top information systems and management fields, and draw the lesson to guide our research in social media. Propositions for future study are proposed and the research agenda is established.