It is interesting how many people volunteer personal information to people they don't know. It's the Gowalla/FourSquare/Twiter world of full disclosure with people you don't know.
Volunteering information to people I don't know is how I let them get to know me. Out of curiosity, how do you let people get to know you?
I watched a girl in line at the grocery store chat up another girl and (she) asked what city she was originally from, what college she went to, how old she was, and in kind, told her full name, what bars she likes to attend on what days, and what time she got off of work and where she was going tonight (a party and address).
So a principle that has been around since humans have been communicating still applies: Be discerning what information you share with who. The volunteering of information is hardly a bad thing. And just because there is a chance that the action could have a negative outcome should not prevent one from taking the action. Crossing the street has a chance of a bad outcome, and some people are paranoid about doing it, and thus don't. Sharing information is just like crossing the street, there are quantities locations and frequency that will increase you chance of getting hurt in both events. Neither one should be avoided entirely.
While this is innocent stuff (sounded like they wanted to date), it doesn't take James Patterson/Dean Koontz/Steig Larsson to write up how this could go bad for someone.
It also doesn't take a genius to follow you through your daily actions and list all the ways in which you choices could turn out terrible. But thank God we aren't limited to only choosing things that are guaranteed to have a perfect outcome!