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This question already has an answer here:

I was just about to answer a question about an iOS problem when suddenly a new answer appeared. It was given by me...? At least, that's what the username "Krumelur" indicates.

What really an interesting coincidence:

  • Both accounts have been active for almost the same period 3 years and 11 months, respectively 3 years and 10 months.
  • Both of us are interested in similar tags
  • Both have similar score (+- 2000)

Is this an error or are usernames really not unique? Do I have an evil twin? Or does the other one have an evil twin? :-)

marked as duplicate by Madara Uchiha, scrblnrd3, Bart, ale, Josh Caswell Feb 3 '14 at 21:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Usernames are not unique - they never have been. – Oded Feb 3 '14 at 21:26
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That's because display names aren't exclusive.

See Why does Stack Overflow allow duplicate display names? for more details.

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    Actually now that I think of it, a duplicate vote would be more appropriate. – Madara Uchiha Feb 3 '14 at 21:27
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Many people can have the same account name. Search for common names on the users list and you''ll get a hundred hits. Email addresses, on the other hand, must be unique. All that would happen is we wouldn't get people using their real names, and adding in special characters

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