MAPPING WI-FI HOTSPOTS — including yours:
Just in case the picture isnâ€™t clear, let me paint it for you:
Skyhookâ€™s trucks have been cruising your street, have identified your home wireless router by its unique code that only your home wifi has – and is correlating it with your location using GPS.
And then they put it in a database.
Read the whole thing.