I have just gone through a divorce and discovered that my ex husband was involved with an other woman whilst married. This has been exposed and as a result, my ex husband's son has put on his facebook wall that I have mental issues, am not fit to have care of my young son 50/50 (as I share the care with my ex husband), that I have drinking problems and am insecure, and that I am an older version of Britney Spears. None of this is true, I am a real estate agent, have a good reputation and I am concerned that this slander on Facebook could affect my work prospects as people talk. I am ready to go and see a lawyer to have him remove this off his facebook wall (he has over 250 friends on it who have viewed it and one of these send me a copy of what he had put on it). What can I do? Where do I stand legally?

Optional Information:
Province: QLD, Australia

Already Tried:
I have texted my ex step son and asked him to remove the slander off his facebook and if not I have no other option than to start legal proceedings. I have also contacting my ex husband and told him the same and he said it has nothing to do with him. It does have everything to do with him as he has had his son bully me throughout the consent orders prior to the divorce so that I would sign the home over to him, which I did.