Facebook messages are not shown any more on my site

Before going through the review process, can you try:
* Setting up the Channel while in development mode
* Setup the Social Stream module on your front-end
* Verify it all works properly, while in development mode

Then, set the app back to Live mode. I *believe* that should work. That will get you going for now and then we can help you start the review process so it will stay working.

Thanks,
Alex