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This problem of multiple instances of the same user happened earlier with engelbrekt(14 users by one person!). At that time Anton mentioned something about the benefits of having an OpenID, etc.. Maybe this could be added to the FAQ.
I merged the two accounts.
Now Gerhard Paseman has three different identities.
@Mariano,
I can't find any of "Gerhard Paseman"'s accounts. Could you tell me the user numbers?
@Qaiochu, how did you find these? When I type either "gerhard" or "paseman" into the user search box, I find nothing. Perhaps I'm seeing a bug?
I have merged these two accounts.
I found the last Gerhard (3300), copied over that OpenID as an alternate, and merged the accounts. 3206 is now the definitive Gerhard Paseman!
If somebody has multiple unregistered accounts, it's probably because their browser is throwing away the MO cookie regularly, so they'll continue to generate more accounts. If this is happening, I don't see the point of merging the accounts. So if somebody has multiple unregistered accounts, I email the owner rather than merging the accounts. Once they register an account, I merge all the unregistered accounts into it. I emailed Gerhard Paseman yesterday, and he said he'd get back to me once he registers an account.
Unregistered users don't show up on the user list (see this meta.SE request) unless you type in their exact display name, but moderators have a way to search for users based on OpenID, email, or display name, which does search unregistered users.
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