The "warhead" names appeared as links, most leading to 404 error messages of pages not found, but some leading to pages of raw programming code.

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In one case, a major content brand was notified that its PageRank had been dropped because of a nearly immeasurable, statistically insignificant, certainly inadvertent error on a few pages.

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But the companies appear to be on different pages about whether human error was to blame.

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