What is the impact of disclosing information about yourself in your profile?

I have to admit, I like to find out what I can about people in their profiles. Some provide a few details that make me wonder more. Then I start to feel a little guilty because I don’t put anything in my profile. I figure if people want to know about me, they can do a little work, and read my answers. You could write a pretty accurate biography from my answers, I think.

But a profile is easy. Spoon fed biography. But what can others get from it? Could you get enough to identify someone in real life? Do you not care if you are identified?

How do you decide what to put there? How do you decide what you want people to know about you? Do you want to be cute or do you really want to give people a little help? Does it even matter much?