I've noticed quite a lot on mumsnet that often when people are discussing slightly personal or otherwise "outey" stuff, they will say they have namechanged and also sometimes say stuff like "yeah I was here for pombears..." etc to prove this.
I understand why someone might want to name change i.e. people in real life may know their usernames or whatever, but why the need to make a point that you are a regular. What difference does it make to the answers you get?