Online Support Groups

In one of the videos yesterday there was a woman talking and she said something that really helped her was online support groups. These groups were anonymous and people were free to say how they feel and talk about their lives. This seems like complete nonsense to me. I do not understand how that woman could go online and in a public forum talk about her problems at home. I myself would not feel comfortable disclosing my personal life to a group of strangers in a place where it will be forever (online). I find it much better to talk to a friends or a family member who is actually close to you rather than people that may not even be who they say they are.