When recently working with the Social Profile entity in Dynamics 365 I came across this error, when trying to update a Social Profile record in D365.
Looking at the log file it provided the below information.
The error seems to indicate of some setting that needs to be turned for enabling the updates to the Social profile. Since this entity is related to the Social Engagement and after digging in for a bit I found the setting that needs to be enabled to fix this error.
If for some reason you have this set to Yes make sure to change it to No and that should fix the error.