A new Bloomberg/BusinessWeek article on private company valuations quotes CapLinked CEO Eric M. Jackson.

According to a study by Nyppex, secondary market valuations of private, venture-backed web companies have increased by 54% since June of this year. This compares to a 21% increase in the Nasdaq. Among the tech high-flyers are Facebook (valued at $41 billion), Twitter ($3.7 billion), and Groupon (which rejected a $6 billion offer from Google).

With the market for public offerings still moribund, demand for high-growth social media companies is being satisfied through private investment.