this question on SO was asked by larz, who has a reputation of 6, and also has an answer by larz, who has a reputation of 1. Both have the same gravatar and username, but slightly different user ids. Shouldn't SO somehow realize they're the same user, based on the email address or something, and unite the accounts?
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Yes it should. There should be a periodic background task that compares users -- e.g. the fact that both the gravatar hashes and the usernames are the same should be easily detectable, and these users should be flagged for moderator review.
Their activity confirmed that it was a unique person. Unfortunately, some people tend to create new accounts unintentionally from time to time. These two accounts have been merged, uniting all of the users activity into one profile.