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Facebook made $557 million last year from fees associated with its virtual currency, known as Credits, accounting for 15% of its revenue, according to a regulatory filing. The market

for the currency is chiefly limited to social games, however, so the company will need to find ways to inject the currency into other kinds of transactions if it wants to increase its Credits-related revenue, according to this blog post. The company could accomplish this by adopting Credits for in-application purchases, digital payments between users and even real-world purchases, Tim Carmody writes.