Will there be DOT-COM crash soon?

Let's face it. Online startups are being valued at exceptionally high price. Groupon will IPO at a $15 billion valuation! Facebook’s (Facebook) worth $50 billion! Zynga raised $366 million! .

I sense situations similar to what we've had in 2000. Do you think there's be a dotcom crash soon? (in next 1-2 years).