Email address for FACEBOOK?

[Rubette73]

If you are using the application on facebook, then it's a high probability that the abuser is as well. You can try reporting the abuser through facebook. However, if the app, like Farmville or Mafia Wars, can be played separate from facebook, then your best bet is to go to the developer's website (in the case of Mafia Wars and Farmville, you would go to http://www.zynga.com) and contact their customer support. Most facebook apps are designed specifically for facebook, and you can report the person through facebook.

*EDIT* --- Ignore the person who suggested you stop using the application. By doing so, you would be letting the abuser win. And that's not fair to you.