In setting up a Facebook Plugin for WordPress I needed my facebook ID. It is no longer just in the URL.
Go to your facebook page and change the “www” in the URL to “graph”. Here is an example.
This did not work for the first time I tried, but eventually it did give me this.
I found this article which helped me locate my ID.
In addition, I needed a customers ID and I used this link to retrieve it. I just used the URL of their facebook page.