Of course domain names are unique... As long as BGP routes aren't poisoned or a million other issues. However, the issue mentioned in this thread isn't whether company ABC has abc.com but that 10 people at ABC can administer abc.com.
Twitter allowing reuse of deleted usernames is completely different than an existing domain that is used as a identity credential to represent different people over time.
This thread is not about whether domains can represent properties on the Internet but whether domains are valid for identification purposes of people as login credentials. They aren't valid, because a domain doesn't uniquely represent a person.
Twitter allowing reuse of deleted usernames is completely different than an existing domain that is used as a identity credential to represent different people over time.
This thread is not about whether domains can represent properties on the Internet but whether domains are valid for identification purposes of people as login credentials. They aren't valid, because a domain doesn't uniquely represent a person.