More and more people are (paper) rich. Another internet bubble?

More and more companies residing (typically) in Silicon Valley are getting $1 billion+ valuations. Are we in the midst of another bubble? Link to the NYT graphic describing some of these companies. According to the article, a bubble doesn't exist, as the previous internet bubble is still fresh in people's minds. Many places are trying to copy this Silicon Valley phenomenon, but is it worth it / sustainable?
posted by JiffyQ on Feb 5, 2013 - 62 comments