Electronic footprints

I'm interested in a story on the BBC web site about young people and social networking sites - it confirms my belief that we should be giving advice to students about privacy. I'm often surprised by the amount of personal information people post, including contact details, dates of birth, addresses, when they're on holiday. I think most of us would be surprised by the electronic footprint we're leaving. The Information Commissioner's Office has developed a web site for young people which has some good advice. Facebook for example has very good privacy settings, if only people used them.

Edit: When I wrote this, I hadn't seen the front page of today's Independent.