Social Networking

There was a post about social networking and the risk of identity theft in the UK posted on BBC news at:

http://news.bbc.co.uk/2/hi/technology/7090096.stm

I am always worried for people that post such personal information online; I don't actually think about identity theft, but, of course, I know that it is a problem. I wonder how to use social networking without placing oneself at risk. Maybe the answer is using a "closed" invitation only kind of social networking. Anyway, I thought the article was interesting and it has tips on making oneself safer too.