This is another take to the problem that a new user asks a question without registering and loses the cookie. In the discussion I linked to, I wanted to prevent this situation from happening, but I became unsure that it was at all possible to prevent it. Therefore, I would like to know what should be done when this happens.
To take a concrete example, I realized that in this question, the asker replied to a comment by posting an answer, which is a typical symptom of multiple accounts. I quickly verified that although the asker and the user who replied had the same user name and the same icon, they were different accounts.
What should I do in a case like this?
- Flag it for a moderator attention by myself explaining the situation.
- Ask the user to do this.
- Ask the user to open a thread on meta.
- Something else.
Also, should I ask the user to register?
- I cannot verify that the two accounts really belong to the same person.
- It seems that only moderators can merge two accounts.