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Tech valuations are once again soaring: Apple (AAPL) recently became the second most valuable company in the world, behind ExxonMobil (XOM), with a market cap of $305 billion. Even more striking is the $50 billion valuation that private investors have placed on Facebook. Groupon, a cyber-coupon company, turned down a $6 billion takeover offer from Google (GOOG) last month, and it's now considering an IPO that could reach $15 billion. "We may be on the cusp of another technology-driven boom," says Erik Brynjolfsson, director of the MIT Center for Digital Business.