Ultimate Facebook Setup

Before the Ultimate Facebook plugin will work I need a Facebook APP ID / API Key.

When I follow the instructions it brings me to a page on facebook. https://developers.facebook.com/docs/guides/web/

This page has information, but it does not correspond with the plugin information and there is no "site url" on the facebook page.

I suspect that facebook has changed their page layout and the plugin has not been updated to reflect the changes.

Can you please help me find the new location for the Facebook APP ID / API Key?

Thank you,