
This post is ill informed
The author is ill-informed about the facts of this article when asserting that MAC addresses could be tied to GMail accounts. MAC is a layer 2 protocol - this means it does not transmit beyond devices on the same 'wire' and on the same subnet - it is not transmitted over the internet. The MAC address is used to route between physically connected devices only and is lost when 'routing' which is layer 3. So this means, even between your home PC and the ISP, the MAC address is lost after is passes beyond you ADSL router. The reason you can scan for MAC addresses by sniffing wifi networks is that the wifi box is effectively 'on the same wire when you connect to it, but again this is just layer 2 and the MAC address is lost immediately once your packets leave your 'local network' and get onto the internet.