Only for who knows how works Couponic sites:
We need 2 or 3 options to be instaled on our site:
1. After a buyer make his purchase he must be asked to share the deal he bought on his wall on facebook or twitter (facebook is a must)
2. With an Facebook app - he must be asked to invite friends to by this deal - if some of his friends buy somthing he must recive $$$ for the referal action.
3. Third option could be Gmail invitation - the buyer invite all his contacts from Gmail Contacts
This option should be inserted on "Thank you page"
It's very important you know how Couponic sites works and you need to have previus experience.