We've been getting a lot of user feedback recently, spiking significantly over the past week, on the amount of application spam people are seeing in their feeds and on their walls. We turned on a new enforcement system yesterday that took user feedback much more heavily into account. This resulted in a number of applications with high negative user feedback being disabled or having certain features disabled. In particular, many applications were disabled which posted to the walls of other users and had very high mark-as-spam numbers.
My apologies for the suddenness of the action. The numbers were high enough to cause a real loss of trust in applications, which can impact the entire platform. Where we have failed is not providing enough feedback about negative engagement metrics to developers before needing to take this action. This is something we are working hard to fix with the new Application Insights that will be launching over the next few weeks - you will have detailed information about both positive and negative engagement of the content your application generates.
If you think you have been disabled in error, you should have received an email to your application's contact email address with a link to appeal. Just in case, the appeal link is https://www.facebook.com/help/contact.php?show_form=dev_disa... . Note that no content is deleted when an application is disabled. If an application is re-enabled, all the content posted by the application will once again be visible.
-Eugene