What information should I not give out on the internet?

[Michael]

Avoid giving out all the personal information that I've made the mistake of giving. After reading your question, I've realized that I've gone too far as my Y!A contacts (when you put them all together) have the following:

1. My name (first & last)
2. My secondary e-mail address (which I use also for communication with a supervisor of mine)
3. The college that I attend (which obviously makes it easy to pinpoint my location)
.
.
.
And worst of all...

4. Access to my Facebook page

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Aside from these items, I would say that Metal Man's answer yields a good list.