I stumbled onto an update from Yahoo! Fire eagle this morning that enables facebook users to integrate more geo location functionality into their account courtesy of the friends on fire applet http://apps.facebook.com/on-fire/ . To use the app you simply add it like any other application you would allow to access your facebook account settings. First though you’ll also need a Yahoo! fire eagle account – http://fireeagle.yahoo.net/. Once added you can invite friends and connect with others that are using friends on fire so you can share your location (precise or more generalized options) and even post notes.
setup your account and determine how much info to share with others
Send a signal puts a message from you on your map
View your position or your contacts on the map
Your signal updates get listed in your updates