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    OT:

    “.. and a few pals ..”

    “..these guys show ..”

    “These guys began with ..”

    The tone of the article is distractingly unprofessional. Why not just “researchers”. Plus I think the “math” tag is unwarranted; this is basic tf-idf with a judicious use of keywords.

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      No, let’s not replace census data with Twitter-derived ‘statistics’.