I really recommend a listen to Daniel Suarez’ talk at the Long Now Foundation, which I missed when it was first posted. Here’s an eye-opening bit from the transcript:

Many of you have Bluetooth devices in your car but you may not know about the TPMS system; this is the tire pressure monitoring system. It was federally mandated by the 2001 TREAD Act. That’s right. You all remember voting for this, right? It says that any car manufactured up to 2007 has to have wireless nozzle pressure measurement devices that communicate with the computer onboard the car to see that your tires are safely inflated. Now, they have to have a unique I.D. so that the computer knows your tires from the car next to you and of course, it is an open standard and makes it very simple to track the unique identity of an automobile; but of course, to do that you would have to have devices scanning. Fortunately, such scanners have started to spring up at choke points throughout modern cities. These are privately owned scanners with the data being gathered and stored again because it’s cheap to store data, vast amounts of data. This data can be piled up along with your financial transactions and anything else and bots can go through it to find persons of interest or they just find patterns or even just to sell you stuff. I’ll give you an example of just a few such devices as a BlueSweep scanner and a BlueSweep scanner is a device that able to identify all bluetooth devices within its radius, identify what their capabilities are, and what exploits they might be vulnerable to. A BlueSniper can do this up to a kilometer away. Let’s go a little further down the wall. There’s the Bluesnarfer you were all expecting. Now Bluesnarfer can use an exploit and given to it by a Bluesweeper to steal your address book, your text messages, your calendar, your pictures of your kitties, and bluetooth car whisperer can push advertising into your car speakers through your car’s bluetooth system. Now more worrisome, it could also be used to hook into your car bluetooth phone system to eavesdrop on conversations in the car. Now, if you combine that with something like the TPMS system or any future open standard device, you could pretty much track a car and listen to its occupants as they move throughout the city at any point in the future or at the moment it’s happening. Now, so you’re walking through this gauntlet of scanning activity with all the wireless devices and again, I’m sure we were all aware of this, and then there’s of course financial transactions every time we buy stuff with a debit card or a credit card. Who, what, where, and when? Combine that with visual data and all of the other points that tell us who was there with you, where you were going can be used to tell some very interesting stories. So it’s a great constellation of information being gathered on us at all times and then of course privately owned devices Hoovering up all these information. So this is the world you live in right now. Who knows what it will be like 10 years from now?