Facebook and Places explained
Services based on your location, such as Foursquare, are popular in the tech-centric bubbles of Silicon Valley and New York City. But for many people, these services remain odd — and potentially creepy — tools on your smart phone to let friends or even strangers know you just showed up to a restaurant, gym or the corner deli.

According to a Pew Internet & American Life Project survey this spring, only 5 percent of adult Internet users in the U.S. have used such a service. With the entry of Facebook Places to the mix, though, this number is likely to grow. For now, here is a rundown for the other 95 percent on what Facebook Places means and how to protect your privacy.
