Virgin's Kickbacks Program
Here’s a very cool campaign from Virgin mobile. Virgin customers can grab a unique code off of the site and post it throughout their Social Network profiles (on Facebook, MySpace, Twitter, etc). If a friend uses the Virgin customer’s code to sign up for the service the Virgin customer gets free minutes and the new referrer gets a discount.
This is pretty much an Affiliate marketing deal — but it is done on a simplistic level that gets Virgin customers to distribute a promotion threw their viral networks. An interesting plus up might be to give the Virgin customer value for just posting the promo codes on and distributing them – rather than only rewarding them if a new customer signs up.
According the DM New the program has already drive 50,000 new sign ups! (link)