I recently had component that pulls facebook photos into a Joomla 1.5 site break. It didn’t pull the photos in. The component’s developers blog didn’t have my fix.
I got lost in setting up Facebook App account connected to Heroku, when all I needed was an AppID and a App Secret. I was confused by canvas page and other parts. It turned out all I needed to provide was a name and the actual URL of the site that had the component installed. I was trying to run it localhost. It looks like that toolkit can be used for building apps locally.
You also need to give your app some time to propagate to their servers.