So prosper has this tower ad out:

Which points to this advertising link:
http://www.prosper.com/prm/lender5.htm?s=eccWith this fine print:
*All loans are made by Prosper Marketplace, Inc. and sold to winning bidders registered as lenders with Prosper. Prosper "lenders" are loan purchasers. Rates of return shown are the average annual returns on Prosper loans originated between 7/1/06 and 10/30/07 to borrowers with AA - C credit grades who requested automatic funding, have 0 - 1 current delinquencies and 0 inquiries in the last 6 months on their credit record, as of 11/30/07. For more information, go to http://www.prosper.com/lend/performance.aspx. Each lender's results will differ depending on the default rate of the lender's portfolio, and may vary over the 3-year term of the loans. Loans and returns on loans are not FDIC-insured and have no Prosper guarantee. Loans may lose value.
Emphasis mine.
Off the top, I was surprised that they were now going for automatic funding. Now, I see that their view date is as of 11/30/07, one month after their loan selection had ended. For a recent advertising campaign, you would think they would be using recent view dates (unless they are trying to dupe some suckers).
Using their OWN criteria, I get
THIS:AA 4.74%
A 7.33%
B 7.71%
C 11.78%
I don't see no stinking 12.81% return on any of those classes.
If we move forward in time to a view date as of 4/29/08 we get
THIS.AA 7.27%
A 5.91%
B 1.76%
C 10.52%
Come on Prosper. There is spinning the truth & then there is not even getting your facts right. If you guys are going to have to tango with the SEC, you need to clean this stuff up now.