New "Geo-tagging" Service Raising Serious Privacy Concerns; Could Show Strangers Where Users, and Their Kids Are. Facebook just launched a geo-tagging service it calls "Places." Basically, it means enables users to share their exact location with their friends who are fellow users -- or perhaps complete strangers. Facebook isn't the first to embrace geo-tagging. Sites such as Twitter and Foursquare have been doing it for a while now. But with more than 500 million active Facebook users worldwide, Places is raising significant privacy questions about the new social media trend. Are there dangers associated with using such services? How easy is it for strangers to learn your location or that of your kids? Tech expert Katie Linendoll calls Places "huge," due to the sheer number of Facebook users.