When the social publishing tool was updated the warnings for image sizes being too large or too many hashtags was removed. Some of my posts were flagged being as unsuccessful with a vague note that Facebook returned an unrecognized error. Please double check the list of potential issues. If you’d like to publish this post, please clone it and try again.
Support was no help in assisting me in determining what the issue was. Turns out after much trial and error on my end there were too many hashtags in them, and one had an image that was too large. HubSpot used to give warnings about these issues PRIOR to scheduling a social post. Not anymore. This went away with the upgrade. Bring this warning back! It was very useful!