The reality of it is that a person's internet persona should not be considered something that is divorced from the real world. What you do and say online can, and does, affect your life in the real world. A more productive way to approaching an online environment is to treat it like you're giving a speech in front of an audience of millions...because essentially that's what your doing. Honestly, I just really dont' want a million people knowing about my private life.
That being said I'm shocked when I see people blog or put personal information online. Sometimes all that information can be a bit endearing, but I still wouldn't recommend it. Another thing that I find disturbing is individuals that put lots of personal contact information online. I think you should assume any comment you make online can be traced back to you but I'm not going to make it easy. That being said, yes, you can probably find me if you wanted to....