Harmful Digital Communications
New legislation in this area is now in force, making it a criminal offence to post any digital communication intending to cause emotional harm. If you are responsible for any on-line platform on which staff can post messages, you need to be aware of the responsibilities of an on-line content host.
Strong recommendation is that you have a clear policy forbidding any harmful digital posts and a simple complaints procedure for any employee to follow if they believe they are being harmed.
Refer https://www.consumerprotection.govt.nz/consumer-law-and-your-rights/online-safety/harmful-digital-communications-act/ for a good summary