Aren't you sometimes surprised that those advertisements which you see while you surf seem to know your exact location Blame your IP address
Some Unknown Perils of Using Proxy Servers
Most people don’t know that everything they do on the internet can be traced back directly to their computers. This is made possible by each computer’s IP or Internet Protocol which is a unique code that is assigned to a particular computer by the ISP or the Internet Service Provider. Each computer only makes use of one IP while on the internet – it acts like the fingerprint of one’s computer.
