Tomorrow should be a pretty good day to live in Farmville: Creator Zynga begins trading publicly on the Nasdaq exchange under the ticker ZNGA, and the company has set the price for the 100 million shares being sold at $10, reports MarketWatch. That would peg the market value of Zynga at $7 billion and make it the biggest US Internet IPO since Google in 2004, notes the Wall Street Journal. The $7 billion valuation is impressive, but it's way under the figure of $20 billion being thrown around earlier this year in giddier days. Next up, Facebook? (More IPO stories.)