I am interested in this too. Apart from the obvious that staff can’t be friends with students on social media (which is not entirely black and white in a small community with some staff being friends or relatives of students), we have a blanket rule that staff cannot interact on our social media apart from the standard emoji reactions. This is because one of the school policies is that staff only communicate with parents and students through formal school channels. So, we delete staff comments, even if they’re really nice. The only exception to this rule is the Principal.
Is this the kind of thing you were thinking of?