MAC address are NOT used in the internet. They are for local networks..
Besides how can you assume that one has such an address? There are millions of internet users without an ethernet card and connected to the internet. Since ethernet card is not a requirement to connect to internet, NICs are not used in the TCP/IP communication either. The only requirement of a TCP/IP protocol is to use an IP address and this is the only information you can get from an internet user in most of the cases.
In NO cases you can get his NIC number on the internet unless he is a local user or he is using some sort of "weird" software that is intentionally posting this information. (I dont know such software either)
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