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And how does SO decide which username to put there?

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up vote 5 down vote accepted

It means 40% of the text was written by Mike Duncan. The user name with the most % is placed there.

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After so many edits, the % starts to reflect who "owns" the most content on the post.

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Jeff describes it on his blog.

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The percentage is to show that certain a person have contributed the most to this post, and how much he contributed. That allows you to quickly tell who put the most effort into the post. Sort of a way to honor that person for writing/organizing information.

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