Thanks for your feedback @mossifer. We are sorry to hear your opinion and that you did not answer the support emails we sent you to solve this issue.
Rest assured, Blog2Social works smoothly on more than 70.000 websites worldwide and it will also work on yours once your settings are correct.
Since you are receiving notifications that we don’t have the permission to post your content on Facebook, it seems that your Facebook settings have to be adjusted.
You can use the following link to get to the Facebook “Business Integrations” and check if you have ticked all boxes in the Blog2Social app:
https://www.facebook.com/settings?tab=business_tools&ref=settings
Please be so kind as to provide your answers to our email, as WP does not allow any further support in the Review section.