The news this week reported on Bloomberg.com doesn’t exactly help provide the answer businesses were looking for, in respect to the question: “What is the true ROI of social media?” Bloomberg reported the following: “Last April, Gamestop opened a store on Facebook in an attempt to generate sales from their growing fanbase of 3.5 million-plus customers who’d declared themselves “fans” of the video game retailer. Less than 6 months later, the store has been quietly…