Facebook comment publishing is partially not working
Incident Report for Swat.io
This incident has been resolved.
Posted Jun 12, 2020 - 15:25 CEST
Facebook is aware and their engineering team is investigating the issue.
Comments might get posted despite the error message, however.

Ongoing Facebook Bug Report can be found here:
Posted Jun 12, 2020 - 08:44 CEST
This incident affected: External APIs (Facebook API) and Swat.io (Web Application).