SEO Tip #37: Why is the @ character ignored in search queries?
Matt Cutts: Well, historically, that was a deliberate choice because we didn’t want to index an email address, at least I think it was a deliberate choice. You don’t want somebody scraping Google to find a bunch of email addresses. So it’s kind of nice not to index the @ sign. It depends.
I could imagine us over time starting to treat that differently but at least for the time being
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