Facebook Places...

Facebook has released a new "Places" application that allows you to check-in your location BUT ALSO allows others to check you in. This means that your physical location could be broadcast across Facebook without your knowledge. If you don't want others to know your physical location (read this article to... see some examples of why you don't want this!), I suggest you follow the steps in this link to disable Places.

http://gawker.com/5616329/the-first-thing-you-should-do-with-facebook-places-dont-let-other-people-tag-you