The Prosper peer lending network is offering a 3% cash back bonus when you invest in featured loan listings through April 24, 2012.
Prosper will put 3% cash back into your account when you invest in Prosper Featured Listings.
This offer begins April 19th at 11:00 AM PT and is only valid through April 24, 2012, at 11:59 PM PT.
All rebates will be paid by May 31, 2012.
Only eligible investments during the promotional period that become funded notes before the payout date will qualify.
This Prosper bonus offer was emailed out to Prosper investment account members, and it is valid for all new and current customers.
You can also earn Prosper $100 Referral Bonuses when you refer your friends to get a loan from Prosper.
Invest in featured loan listings at Prosper.com to get a 3% cash back bonus on your Prosper investment.

I take it this is also an open invitation offer? They don’t seem to ever advertise this publicly on their web site.
Hello TekGems,
Yes, this is an open offer for any new or current members. It would be nice if they posted about these offers online somewhere, but they just seem to email them out to members at this point.
Good luck. Max