(Bloomberg View) -- The data scientists writing the algorithms that drive giants like Alphabet Inc. (Google) and Facebook Inc. are today's technology wizards, and companies and governments increasingly use their creations -- often in secret and with little oversight -- to do everything from hiring and firing employees to identifying likely suspects for police monitoring.

But there's a dark side -- and computer scientists warn that we'll need a lot more transparency if the big-data revolution is really to work for all of us.

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