Which gaming platform first introduced a fully integrated marketplace allowing third-party developers to sell virtual items for real money, creating a revolutionary e-commerce model that's now industry standard?

The gaming industry has revolutionized e-commerce with innovative in-game purchasing systems and virtual marketplaces. From cosmetic items to full expansion packs, gaming platforms have created unique retail ecosystems worth billions. This poll tests your knowledge about a pivotal moment in gaming's e-commerce evolution that changed how digital goods are sold and consumed across virtual worlds.

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Steam Workshop (2011)
Xbox Live Marketplace (2005)
PlayStation Store (2006)
Second Life Marketplace (2003)