Coordination is an important success factor for a development project. Communication gaps, e.g. between product owners shaping the requirements and testers verifying the developed software can result in wasted effort and unsuccessful products. We propose improving the communication between project members with recommendations of whom to interact with and what to discuss based on link prediction in multi-layered proximity-based social graphs based on data mined from project repositories. We plan to explore and validate these ideas through prototyping and by applying a design-science approach in collaboration with an industrial partner.