I’ve written in this blog before about Facebook’s privacy issues, and the importance of making sure the privacy settings in your Facebook profile match what you want to have happen to your personal data. Brian posted on this same topic and has some good points and detailed instructions; the comments are also worth reading.
I went and checked my settings and found they looked a little different to what I remembered, so it’s probably a good idea to check your settings on a regular basis; as Facebook changes what they do they may change which options exist. And think about what you want, about that balance between letting out enough information so old friends can find you again (as lots of people want) and making sure that not too much information gets out. I changed most of mine to “friends only” from the default “my networks and friends”; maybe at some stage I’ll change some of them back again but for the time being I feel more comfortable this way.