Ok, I flat out love these auctions that SecondMarket are holding for privately held Facebook shares. Last week the first one closed, and $40 million of stock changed hands at $20.76 per share, valuing the company at roughly $50 billion.

This week&'s auction has now closed. Only 475,000 shares moved, compared to 1.9 million last week. The auction closing price edged up 1.2% to $21.01, about $10 million worth of stock total.

Stay tuned for next week&'s auction. What do you think the closing price will be Closest guess gets a TechCrunch tshirt.

Here&'s the email to SecondMarket participants:

Thank you to those who participated in this week‚a4‚¬‚a4„s Facebook auction. The auction was again successful and fully cleared at a per share price of $21.01. Next week, the reserve price will be $21.50, and we will continue to require a minimum sale and minimum purchase of 25,000 shares.

If you own shares that you are eligible to sell and wish to participate as a seller, please complete the attached Seller Information Sheet and submit it to SecondMarket at fb@secondmarket.com by Monday, December 6 at 11:59 PM EST.

If you would like to participate as a buyer, please complete the attached Buyer Information Sheet and submit it to SecondMarket at fb@secondmarket.com by Wednesday, December 8 at 12:00 PM EST.

Please see below for detailed results on previous auctions and for this week‚a4‚¬‚a4„s auction calendar:

Previous Auction Results:

Total Shares Cleared to Date: 2,371,265

November 22, 2010:

Total Number of Shares Offered for Sale: 1,896,265

Number of Shares Cleared in Auction: 1,896,265

Reserve Price: $20.60

Clearing Price: $20.76

November 29, 2010:

Total Number of Shares Offered for Sale: 475,000

Number of Shares Cleared in Auction: 475,000

Reserve Price: $20.60

Clearing Price: $21.01

Next Week‚a4‚¬‚a4„s Auction Timeline:

a4s‚· Monday, December 6 at 10:00 AM EST ‚a4‚¬‚a4œ Auction process commences

a4s‚· Monday, December 6 at 11:59 PM EST ‚a4‚¬‚a4œ Seller order forms due

a4s‚· Tuesday, December 7 at 9:00 AM EST ‚a4‚¬‚a4œ Buyers informed of share quantity available

a4s‚· Wednesday, December 8 at 12:00 PM EST ‚a4‚¬‚a4œ Buyer order forms due

a4s‚· Wednesday, December 8 at 5:00 PM EST ‚a4‚¬‚a4œ Participants informed of auction results

a4s‚· Wednesday, December 8 at 8:00 PM EST ‚a4‚¬‚a4œ Transaction documentation distributed to buyers and sellers

a4s‚· Friday, December 10 at 4:00 PM EST ‚a4‚¬‚a4œ Completed transaction documentation due from buyers and sellers

a4s‚· Friday, December 10 at 7:00 PM EST ‚a4‚¬‚a4œ Notice to be sent to Facebook, Inc.

Please contact fb@secondmarket.com or 212-668-5183 if you have any questions.