best viral app

Hi!
Im searching for someone with some nice viral facebook application. I've got an voting app with 5000 polish users that allowed me to post on their walls and i want to monetize it.
Any ideas welcome!
Thanks

does your app create FB accounts for voting on contests?

If you haven't saved the access tokens and userids of the users, you won't be able to use it. And even if you try to spam by automatically posting on their facebook walls, facebook will restrict your app.
Your best bet will be to re engage the current users and try to get more users for the app.