I just read this article which clearly demonstrates WHY it matters what information you share publically on the internet (here, on facebook, on dating sites, etc).
www.cultofmac.com/157641/this-creepy-app-isnt-just-stalking-women-without-their-knowledge-its-a-wake-up-call-about-facebook-privacy/
Obviously it's up to you whether you care if people know what schools you went to, the full names of your parents and children, your address, etc but AIBU to think that companies like Facebook and Foursquare shouldn't be allowed to share this information (or any information specific to a user) with third parties?