We've just added an additional metric to our Facebook Pages data source in Funnel! You can now include Page ID in your reports.
Please note that no action is required to see data for this metric going forward.
You can learn more about the data you can obtain from Facebook Pages in this article.
We hope that you find this new metric useful! If you have any questions or if you would like historic data for this metric, please contact firstname.lastname@example.org and we'll be happy to help.