The SecondMarket Facebook shares auctions are back on after a holiday break, and the valuation is up big time. The last auction prior to this one closed December 15 at $22.75/share. Today it hit $28.26 per share. With 2. 5 billion or so shares outstanding, that's a $70.65 billionish valuation. A month and a half ago shares were trading on SecondMarket at a $50 billion valuation. What's changed? The Goldman Sachs investment announced earlier this month increased the hype even further. No wonder the SEC is starting to pay attention to these trades. Sounds like Accel Partners may have sold a little before the peak.