Social profiling

Today someone called me "a fucking creepy ass stalker" for referencing something mentioned in their LJ profile in a reply to them on a comm, enjoining me point blank from making use of "information that I didn't give you." I admit, I found this bewildering. After all, what are the data on someone's profile if not information they are giving to you and everyone else on the Internet? I know I don't have anything there that I wouldn't want everyone--from my grandma to my worst enemy--to know about.

So my question to you all is: Who is your LJ Profile for? Who do you expect to read it and what are you comfortable with them doing with the information listed there? What edits have you made because of the uses to which the information there was put on LJ or elsewhere?