Ron,
I agree that a website is and should be the primary/official communication tool for departments. Autonomy/efficiency in posting may be a better goal as posting independently to our website and social media accounts can be time consuming, especially if you are out on an incident and want to get information out fast. We have also noticed that we often seem to get more interaction on social media if it is posted directly in a social media app versus a link back to our website.
By reporting abuse, a moderator will be asked to review the content of this interaction to take further action, if necessary.