I've written previously about Internet safety for those in the middle of a divorce or post-divorce difficulties. In particular, I've warned about use of Facebook and MySpace. These social networking websites can offer a wealth of information that might be used against someone who's battling for custody of children or have other issues (such as spousal support) that can be impacted by disclosure of activities.
The New York Times has published a terrific list of ways folks can protect their privacy while using Facebook. I am sure they also apply to sites such as MySpace.
You can read the NY Times article 5 Easy Steps to Stay Safe (and Private!) on Facebook here.
Earlier articles about protecting your privacy when online or using a computer another might have access to (or might have had access to) can be found here.