Most public bodies have a Social Media Policy due to the potential for reputation damage to the individual and their organisation if ill-judged or unguarded comments are made. The problem with the internet is that once a post is published it cannot be withdrawn. Even if the originator deletes it the comment will have already been registered with the other members of that particular group. Chances are it will re-surface at the most inopportune moment to the intense embarrassment of the originator.
A classic example is Emily Thornberry’s ill-judged tweet “Image from #Rochester” which cost her a shadow cabinet position. Admittedly she has now been reappointed as Shadow Foreign Secretary but there were probably not a lot of alternative options. I doubt that she will be invited to support the labour candidate in the Copeland by-election.
As a holder of public office it is very unwise to argue with another user on social media. As many people have found to their cost the watching audience can be vast – ask Sally Bercow who thought she was being ever so clever by asking a “loaded” question and regretted it later to her cost.