Shaping collective action in financial markets through popular expertise: An analysis of Due Diligence posts on WallStreetBets

Analyzes the 150 most-upvoted Due Diligence posts on r/wallstreetbets plus interviews with eight community members to explain how the community shaped the 2021 meme-stock collective action that forced a multi-billion-dollar hedge fund to close a year later. A 'popular expertise' propagated in a hybrid language mixing financial analysis with pop-culture style; resentment about market unfairness mobilized the action but did not produce a sustainable collective movement.