Aussie Childcare Network Forum

Hi I am wanting advice on a fellow co-worker. I have witnessed a fellow co-worker write in a forum on social media about the centre we work at the children and room this co-worker works in and other staff members in this post. The co-worker also goes on to write some pretty bad things about our work place and strong opinion’s on peoples personally. There are other things said which I feel boarder line on abuse but I am unsure what I am to do? I am only new to childcare and this centre? Any advice would be appreciated. I feel if I just took it to the centre manager it would go no where which is sad. And I don’t want to be getting targeted for doing the right thing. Thank you.