Internet discussion sites have become an enduring feature of modern asset markets. While prior research demonstrated a strong link between communicative practices and market behaviour, more work is required to fully understand the processes that support knowledge co-creation in these environments. To address this gap, we propose a research project to (1) Identify the factors that drive communication and influence knowledge co-creation, (2) examine how systematic variations in these factors influence investment and trading decisions, and (3) develop a decision support tool that combines communication analysis and "what-if" scenario modelling to forecast impacts on capital markets. The practical goals for this project are to help improve investor decision-making and assist regulators through better detection of market manipulation.