Despite the exponential rise of social media use in external stakeholder engagement, academic research and managerial practice have paid little attention to how it can be used for open innovation across the entire innovation funnel, spanning ideation, R&D, and commercialization. As a result, there is little understanding of how companies can organize for and implement social media for open innovation. Utilizing a multiple case study design, this article examines its application across the entire innovation process. It proposes a range of organizational and technological adaptations that managers can implement to ensure they realize the innovative benefits of social media application. (Keywords: Social Media, Open Innovation, Ideation, R&D, Commercialization) T he use of social media to connect, interact, and collaborate with consumers has dramatically increased in recent years. According to Naylor, Lamberton, and West, by 2011 approximately 83% of Fortune 500 companies were using some form of social media to connect with consumers.1 Advances in internet, collaboration tools, and web 2.0 technologies have been the key driver of this transition, allowing firms to collaborate more easily and at low cost with large numbers of consumers.2 In particular, social media platforms such as Facebook and Twitter are increasingly being used as tools for external stakeholder engagement. 3 The increased outreach and richness offered by these platforms facilitates many-to-many interactions and are a powerful knowledge source. 4 Online communities let companies draw insights from a deep, diverse knowledge pool that can be applied to organizational innovation. 5 The community character promotes creativity and quality of contributions, since participants from different backgrounds with different areas of expertise, skills, and experiences can work together. 6 Howe describes this new paradigm "as everyday people using their spare cycles to create content, solve problems, even do corporate R&D. crisps. By understanding what consumers' value and engaging in active dialogue and interaction, companies are able to develop superior value propositions that are more relevant to their target audience. 8 On top, consumer's direct involvement in internal activities helps forge a deep emotional bond with the company that can lead to enhanced loyalty, satisfaction, and brand perceptions. 9 To date, research has focused on the business applications of social media in relation to marketing activities for increased equity and profitability, 10 as well as business analytics.11 Yet, despite the growing influence of social media on organizational processes, research is limited in examining its application to innovation, 12 particularly with regards to how social media can be used as a tool to facilitate open innovation and user collaboration at different stages of the innovation funnel-ideation, R&D, and commercialization. While there is a general understanding of the link between social networks and innovative activities with external stakeholders, 1...