I have been subscribing to Nixle alerts on Facebook from our local sheriff's department for some time now and I find the traffic and weather alerts quite useful. Occasionally, they will also post missing persons bulletins, crime alerts, and crime and safety tips. If your local law enforcement organization provides such a service, it's well worth subscribing.
Police departments around the United States have begun to incorporate Facebook into their policing efforts, using the network to serve a variety of needs. Pages created to find missing persons have rendered useful information and tips on police pages or the pages of criminal elements have led to arrests.
Read more at www.insidefacebook.com