339261 Facebook application-giveaway

Users can submit a story and when it is published the person is entered to win prizes. An excerpt of the story is published on the user's wall, with a link to "read more" and sponsored by "Company." The user is asked to share with friends. Whenever those friends share with 5 friends they are also entered into the giveaway. Should have links to promotional microsite. Please only reply if you have written Facebook applications and can provide sample(s).