What can I do about an employee making negative comments about the company on social media? Employment Law for Employers
It depends whether your company has a social media policy. If it does, refer to this and follow any necessary procedures.
If there is no policy in place, depending on the severity of the comments, it might be necessary to start the disciplinary process whether formal or informal.
It’s a difficult area due to the balance between personal opinion and what is actually damaging commercially.