Facebook Valuation Update

Michael Arrington writes in TechCrunch about a  January 12 check of Second Market that revealed Facebook shares reached $28.26 per share, so now we are up to a $70B?! (Professor Aswath Damodaran had some comments about this phenomenon "back when" the valaution was at $50B.)

The TechCrunch article shares the previous auction closing prices:

Facebook shares clearing price in the most recent  Second Market auctions: January 12, 2011: $28.26 December 15, 2010: $22.75 December 8, 2010: $21.90 December 1, 2010: $21.01