Nov 29th Update: Facebook reported this issue as resolved.
Facebook has reported of "major outage" on all of their reporting APIs.
This affects query performance on the following data sources:
-Facebook Public Data
-Instagram Public Data
During this outage, you may experience slow query refresh times or errors.
We will update the situation when new information comes available.
Read more from Facebook issue report at: https://developers.facebook.com/status/issues/2287293591515186/