It marked the first time authorities have invoked the 2001 Patriot Act against a virtual currency.
Bergquist says Facebook takes a 30% cut of the transactions conducted with its Credits virtual currency.
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Cyber-thieves are attempting to cash in on the rising value of the bitcoin virtual currency.
Facebook also needs social games in order for its new virtual currency Credits to be successful.
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The Bitcoin virtual currency lost half its value on Wednesday because of a panic sell-off.
Facebook began testing its virtual currency, called Credits, in 2009 with some popular games on Facebook.
Players can also buy virtual currency called Crowns and spend it on in-game pets and gear.
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Thus it's not clear to everyone why the world really needs this grand experiment in virtual currency.
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Payments for goods are made with the virtual currency Bitcoin, making it hard to track users buying drugs.
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Purchases could be paid for with Facebook Credits, the virtual currency payment system Facebook introduced in 2009, added Serbinis.
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New York bank regulators said they are also discussing the issues with virtual currency exchanges operating in the state.
In addition, Facebook is now charging a 30% transaction fee for using its all-but-mandatory virtual currency, Facebook Credits.
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Here are some interesting statistics from Social Gold, a virtual currency and payments system for social games and applications.
Using the bar, players can also directly purchase virtual currency with real money.
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Such wild swings could make it difficult for the virtual currency to gain traction among investors and businesses alike, experts said.
Playfish gave Pet Society players further incentive to buy the flowers by offering them free virtual currency with each purchase.
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This virtual currency will be available for U.S. customers to purchase apps, games, and in-app items on the Kindle Fire.
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The bitcoin virtual currency has had a volatile 24 hours that saw values plummet, hack attacks, trading shutdowns and bitcoin-stealing malware.
Typically, a player will have to go to an outside site like PayPal to purchase virtual currency, interrupting the game experience.
Apple has cracked down against the latter and doesn't allow apps to give users virtual currency in exchanging for downloading an app.
Facebook is announcing the next phase in its roll-out of its virtual currency Facebook Credits, which is leaving beta testing today.
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The gang had been receiving the money in a variety of ways - including using virtual currency such as Bitcoin, Europol said.
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The selling frenzy began as Bitcoin's main exchange, MTGox, struggled to keep up with the volume of trade in the virtual currency.
Earlier this year the firm said it wanted applications running on its platform to accept its virtual currency, known as Facebook Credits.
Users sign up for free and get 5, 000 units of virtual currency.
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The virtual currency also is starting to make inroads in the brick-and-mortar world, where customers can pay with bitcoins using their mobile phones.
For the thrifty gamer, however, revisiting and completing earlier stages with your improved arsenal is a great way to pad your virtual currency.
Bitcoin startups are beginning to raise sizable investment capital even as industry leaders warn that hackers are abusing the Internet virtual currency for profit.
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