We are aware of an issue with Facebook's network randomly affecting posts in the publisher and replies to comments within the inbox.
They have this current bug open https://developers.facebook.com/support/bugs/448867966487671/
and have updated their status page here https://developers.facebook.com/status/dashboard/
with a degraded performance.
During this time, you might see the following publishing error:
"Facebook error: Please reduce the amount of data you're asking for, then retry your request (code 1, subcode null) 'null - null'"
Please be aware that despite this error message, your content and reply may still be successfully published to Facebook.
We will continue to update this incident when we have more information from Facebook