people who don't want their location known should not use the internet. anyone that parinoid should keep their head. Giving out critical personal information such as SSAN, banking and credit account numbers, etc is certainly illegal. But I don't see the harm in knowing what city someone is at.

I think No one would be interested for displaying ads keyed to words in their mail and the search being tracked through email address. http://www.templetons.com/brad/gmail.html