>So facebook sent me a cease and desist threat for revealing that they were tracking all vehicles driving by their campus and then telling the city of menlo park of this.

Do you have a blog or some such going into more details? This raises all sorts of curiousness. How did you find out this is what was going on? What justifications did FB claim for doing the tracking? What justifications did FB claim for stopping you from talking about it? As the Robot says "Data inadequate!"