Warning: Real potato farmers should stop reading here. This might ruin your week. A San Francisco-based company just cleared $830,000 US in two weeks by selling seed potatoes. The potatoes are virtual but the money is very, very real. Zynga is a developer of apps for Facebook and the iPhone. One of their biggest hits is... get this... a game about farming. Farmville lets users own and manage a virtual farm. Apparently it's very addictive. At least, the 20 million users who are currently playing…
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