> Here's a prediction: as the easy money QE party comes to an end, the stock market melts, Twitter's growth grinds to a complete halt, investors realize there's only so much time in the day and Twitter has lost the messaging space, Twitter is worth $5 to $7 billion if they're lucky.

It's not the QE money pumping up Twitter, it's a combination of tech being hot and a limited number of shared available (much of TWTR is still in lockup). If it were QE you'd see all sorts of firms with crazy valuations, but the standard blue chips are still pretty standard.