Still anyone with this problem? I had a similar problem and tried to add code in page via the iframe component. For me it was solved very simply:
- by cut the code on the Iframe
- going to the track and analyze section (in advanced settings).
- There I added (at the right top of the screen) a new tool and chose adapted/custom.
- Next, I selected the page where I needed the facebook connection and added it to the beginning of the body
- I ran the basic facebook code example with my own app Id and it worked - no more URL Blocked message
Hopes this helps!