Not before time, Facebook has announced it will allow a "panic button" application on its social networking site. Full story is on the BBC here:
http://news.bbc.co.uk/1/hi/technology/10572375.stm and more about CEOP on their Facebook page here:
http://www.facebook.com/clickceopThe panic button is designed to help anyone of any age stay safer online whilst using the Facebook social networking site. It makes sense to add it to your profile if you're a Facebook user, and make sure your children have it installed in their Facebook profiles too.