Another reason to keep online and offline lives separate:

According to this article in The Register, resourceful employers are starting to check for unwanted behaviour patterns online before employing people.

Now I don't use my name and certainly not my full name in my journal, like many of you. I do use pictures - but pictures are a lot harder to search on. What about email addresses? Googling for my email address doesn't seem to turn anything up, so that looks good.

A warning though, more reasons to keep online and offline lives separate!