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According to this wikipedia article

Followings are reserved domains:

example: reserved for use in examples
invalid: reserved for use in obviously invalid domain names
localhost: reserved to avoid conflict with the traditional use of localhost 
           as a hostname
test: reserved for use in tests

However I can see that someone is using and So is that wiki is incorrect or rules are changed in INTERNET world?

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up vote 4 down vote accepted

Top level domain names are things like ".com", ".org", ".net." and country codes.

The reserved ones you list are for ".invalid" not "". The Wikipedia article links to more info for each one:

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