Which digital distribution platform was the first to successfully implement a large-scale virtual item marketplace with player-to-player trading for in-game cosmetics and items?

The gaming industry has undergone massive changes in how products reach consumers. From physical cartridges in specialty stores to digital marketplaces and virtual item shops, the retail strategy for gaming products has transformed dramatically. This poll tests your knowledge of a significant shift in gaming retail that changed how players purchase and access games forever.

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Steam (with the introduction of the Steam Community Market in 2012)
PlayStation Store (with PlayStation Home marketplace in 2008)
Xbox Live Marketplace (with Avatar Marketplace in 2009)
Origin by EA (with the Ultimate Team transfer market in 2011)