Other than Facebook and Zynga stock prices, is there other evidence that a bubble has popped? I haven't seen signs of funding or liquidity drying up. Valuing Fa

Other than Facebook and Zynga stock prices, is there other evidence that a bubble has popped? I haven't seen signs of funding or liquidity drying up. Valuing Facebook at $50 billion rather than $100 billion could be the sign of a massive slowdown in Silicon Valley... or it could just be a market correction to Wall Street hype.