Thanks for this link David.
http://www.theage.com.au/technology/technology-news/facebook-the-new-fast-track-to-divorce-courts-20110126-1a5f2.html
Early on I realised that as long as I remember Facebook is public space, and I could be overheard at any time, I am not likely to get into trouble with it.
The danger is that when it is just you and the screen, it can all seem very cosy and private.