The App Review process is required by Facebook to use some specific permissions and features on your site. The review process can be started from the
Facebook Developer Area
by clicking into your app and going to the App Review -> Requests tab.
The process of App Review is explained on the page itself, but we also have an overview that you can view in our blog post,
Facebook App Review Explained
. Basically, you need to explain to Facebook how you want to use the manage_pages permission on your site. The answer and what you need to explain is:
We are using the manage_pages permission to post content from our site to our Facebook Page. We are not asking visitors to our site for this permission. It will only be requested of administrators of our Facebook app.
Supporting pictures and other information you provide will help get it approved.
I hope that helps,
Alex